61616020 has 24 divisors (see below), whose sum is σ = 130116168. Its totient is φ = 24508800.

The previous prime is 61616017. The next prime is 61616047. The reversal of 61616020 is 2061616.

It can be written as a sum of positive squares in 4 ways, for example, as 5035536 + 56580484 = 2244^2 + 7522^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61615982 and 61616000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4891 + ... + 12130.

It is an arithmetic number, because the mean of its divisors is an integer number (5421507).

Almost surely, 2^61616020 is an apocalyptic number.

It is an amenable number.

61616020 is an abundant number, since it is smaller than the sum of its proper divisors (68500148).

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

61616020 is a wasteful number, since it uses less digits than its factorization.

61616020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17211 (or 17209 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 61616020 is about 7849.5872502954. The cubic root of 61616020 is about 394.9703978243.

Adding to 61616020 its reverse (2061616), we get a palindrome (63677636).

The spelling of 61616020 in words is "sixty-one million, six hundred sixteen thousand, twenty".