| Base | Representation |
|---|---|
| bin | 1110101011111… |
| … | …1010111000100 |
| 3 | 11021220122222200 |
| 4 | 3222333113010 |
| 5 | 111232214340 |
| 6 | 10040154500 |
| 7 | 1345413252 |
| oct | 352772704 |
| 9 | 137818880 |
| 10 | 61601220 |
| 11 | 318549aa |
| 12 | 18768a30 |
| 13 | c9baa35 |
| 14 | 82775d2 |
| 15 | 561c330 |
| hex | 3abf5c4 |
61601220 has 72 divisors (see below), whose sum is σ = 193316760. Its totient is φ = 15859200.
The previous prime is 61601209. The next prime is 61601227. The reversal of 61601220 is 2210616.
It is a happy number.
61601220 is a `hidden beast` number, since 61 + 601 + 2 + 2 + 0 = 666.
It can be written as a sum of positive squares in 4 ways, for example, as 7225344 + 54375876 = 2688^2 + 7374^2 .
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 61601193 and 61601202.
It is not an unprimeable number, because it can be changed into a prime (61601227) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 681 + ... + 11120.
It is an arithmetic number, because the mean of its divisors is an integer number (2684955).
Almost surely, 261601220 is an apocalyptic number.
61601220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 61601220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96658380).
61601220 is an abundant number, since it is smaller than the sum of its proper divisors (131715540).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
61601220 is a wasteful number, since it uses less digits than its factorization.
61601220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 11845 (or 11840 counting only the distinct ones).
The product of its (nonzero) digits is 144, while the sum is 18.
The square root of 61601220 is about 7848.6444689513. The cubic root of 61601220 is about 394.9387716878.
Adding to 61601220 its reverse (2210616), we get a palindrome (63811836).
The spelling of 61601220 in words is "sixty-one million, six hundred one thousand, two hundred twenty".
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