61815056 has 20 divisors (see below), whose sum is σ = 126070800. Its totient is φ = 29280672.

The previous prime is 61815031. The next prime is 61815073. The reversal of 61815056 is 65051816.

It is a happy number.

61815056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61815056² = 7642202296566272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101366 + ... + 101973.

It is an arithmetic number, because the mean of its divisors is an integer number (6303540).

Almost surely, 2^61815056 is an apocalyptic number.

It is an amenable number.

61815056 is an abundant number, since it is smaller than the sum of its proper divisors (64255744).

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

61815056 is a wasteful number, since it uses less digits than its factorization.

61815056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203366 (or 203360 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 61815056 is about 7862.2551472208. The cubic root of 61815056 is about 395.3952269105.

The spelling of 61815056 in words is "sixty-one million, eight hundred fifteen thousand, fifty-six".