56821766 has 4 divisors (see below), whose sum is σ = 85232652. Its totient is φ = 28410882.

The previous prime is 56821757. The next prime is 56821781. The reversal of 56821766 is 66712865.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 14205440 + ... + 14205443.

It is an arithmetic number, because the mean of its divisors is an integer number (21308163).

Almost surely, 2^56821766 is an apocalyptic number.

56821766 is a deficient number, since it is larger than the sum of its proper divisors (28410886).

56821766 is a wasteful number, since it uses less digits than its factorization.

56821766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28410885.

The product of its digits is 120960, while the sum is 41.

The square root of 56821766 is about 7538.0213584203. The cubic root of 56821766 is about 384.4485634512.

The spelling of 56821766 in words is "fifty-six million, eight hundred twenty-one thousand, seven hundred sixty-six".