61615656 has 96 divisors (see below), whose sum is σ = 173838600. Its totient is φ = 19699200.

The previous prime is 61615573. The next prime is 61615663. The reversal of 61615656 is 65651616.

It can be written as a sum of positive squares in 4 ways, for example, as 52794756 + 8820900 = 7266^2 + 2970^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 61615656.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268950 + ... + 269178.

Almost surely, 2^61615656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61615656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86919300).

61615656 is an abundant number, since it is smaller than the sum of its proper divisors (112222944).

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

61615656 is a wasteful number, since it uses less digits than its factorization.

61615656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 372 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 61615656 is about 7849.5640643287. The cubic root of 61615656 is about 394.9696200531.

The spelling of 61615656 in words is "sixty-one million, six hundred fifteen thousand, six hundred fifty-six".