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BaseRepresentation
bin1110111100100100
310002222102
432330210
53424340
61151232
7343325
oct167444
9102872
1061220
1141aa5
122b518
1321b33
141844c
1513215
hexef24

61220 has 12 divisors (see below), whose sum is σ = 128604. Its totient is φ = 24480.

The previous prime is 61211. The next prime is 61223. The reversal of 61220 is 2216.

Adding to 61220 its reverse (2216), we get a palindrome (63436).

It can be written as a sum of positive squares in 2 ways, for example, as 43264 + 17956 = 208^2 + 134^2 .

It is not an unprimeable number, because it can be changed into a prime (61223) by changing a digit.

61220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1511 + ... + 1550.

It is an arithmetic number, because the mean of its divisors is an integer number (10717).

261220 is an apocalyptic number.

It is an amenable number.

61220 is an abundant number, since it is smaller than the sum of its proper divisors (67384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64302).

61220 is a wasteful number, since it uses less digits than its factorization.

61220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3070 (or 3068 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 61220 is about 247.4267568393. The cubic root of 61220 is about 39.4122390623.

The spelling of 61220 in words is "sixty-one thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 3061 6122 12244 15305 30610 61220