56781700 has 72 divisors (see below), whose sum is σ = 131991552. Its totient is φ = 21127680.

The previous prime is 56781617. The next prime is 56781707. The reversal of 56781700 is 718765.

It is a super-2 number, since 2×56781700² = 6448322909780000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (56781707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215769 + ... + 216031.

It is an arithmetic number, because the mean of its divisors is an integer number (1833216).

Almost surely, 2^56781700 is an apocalyptic number.

56781700 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 56781700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65995776).

56781700 is an abundant number, since it is smaller than the sum of its proper divisors (75209852).

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

56781700 is a wasteful number, since it uses less digits than its factorization.

56781700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 56781700 is about 7535.3632958206. The cubic root of 56781700 is about 384.3581817834.

The spelling of 56781700 in words is "fifty-six million, seven hundred eighty-one thousand, seven hundred".