56780538 has 16 divisors (see below), whose sum is σ = 115486560. Its totient is φ = 18605936.

The previous prime is 56780519. The next prime is 56780551. The reversal of 56780538 is 83508765.

It is a self number, because there is not a number n which added to its sum of digits gives 56780538.

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, 79845 + ... + 80552.

It is an arithmetic number, because the mean of its divisors is an integer number (7217910).

Almost surely, 2^56780538 is an apocalyptic number.

56780538 is an abundant number, since it is smaller than the sum of its proper divisors (58706022).

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

56780538 is a wasteful number, since it uses less digits than its factorization.

56780538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160461.

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 56780538 is about 7535.2861923088. The cubic root of 56780538 is about 384.3555598867.

Subtracting from 56780538 its sum of digits (42), we obtain a triangular number (56780496 = T₁₀₆₅₆).

The spelling of 56780538 in words is "fifty-six million, seven hundred eighty thousand, five hundred thirty-eight".