61520904 has 32 divisors (see below), whose sum is σ = 170892000. Its totient is φ = 20506896.

The previous prime is 61520891. The next prime is 61520923. The reversal of 61520904 is 40902516.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 142194 + ... + 142625.

It is an arithmetic number, because the mean of its divisors is an integer number (5340375).

Almost surely, 2^61520904 is an apocalyptic number.

It is an amenable number.

61520904 is an abundant number, since it is smaller than the sum of its proper divisors (109371096).

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

61520904 is a wasteful number, since it uses less digits than its factorization.

61520904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284834 (or 284824 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 61520904 is about 7843.5262478046. The cubic root of 61520904 is about 394.7670559442.

The spelling of 61520904 in words is "sixty-one million, five hundred twenty thousand, nine hundred four".