56787990 has 64 divisors (see below), whose sum is σ = 164934144. Its totient is φ = 12215808.

The previous prime is 56787977. The next prime is 56788009. The reversal of 56787990 is 9978765.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4384 + ... + 11523.

It is an arithmetic number, because the mean of its divisors is an integer number (2577096).

Almost surely, 2^56787990 is an apocalyptic number.

56787990 is an abundant number, since it is smaller than the sum of its proper divisors (108146154).

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

56787990 is a wasteful number, since it uses less digits than its factorization.

56787990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15941.

The product of its (nonzero) digits is 952560, while the sum is 51.

The square root of 56787990 is about 7535.7806496739. The cubic root of 56787990 is about 384.3723737014.

The spelling of 56787990 in words is "fifty-six million, seven hundred eighty-seven thousand, nine hundred ninety".