56781900 has 108 divisors (see below), whose sum is σ = 203427952. Its totient is φ = 12977280.

The previous prime is 56781841. The next prime is 56781919. The reversal of 56781900 is 918765.

56781900 is a `hidden beast` number, since 567 + 8 + 1 + 90 + 0 = 666.

It is a super-2 number, since 2×56781900² = 6448368335220000, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1794 + ... + 10806.

Almost surely, 2^56781900 is an apocalyptic number.

56781900 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56781900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101713976).

56781900 is an abundant number, since it is smaller than the sum of its proper divisors (146646052).

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

56781900 is a wasteful number, since it uses less digits than its factorization.

56781900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9040 (or 9030 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 56781900 is about 7535.3765665692. The cubic root of 56781900 is about 384.3586330528.

The spelling of 56781900 in words is "fifty-six million, seven hundred eighty-one thousand, nine hundred".