56692721 has 4 divisors (see below), whose sum is σ = 56796912. Its totient is φ = 56588532.

The previous prime is 56692711. The next prime is 56692747. The reversal of 56692721 is 12729665.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56692721 - 2¹⁰ = 56691697 is a prime.

It is a super-2 number, since 2×56692721² = 6428129228767682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56692711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51275 + ... + 52368.

It is an arithmetic number, because the mean of its divisors is an integer number (14199228).

Almost surely, 2^56692721 is an apocalyptic number.

It is an amenable number.

56692721 is a deficient number, since it is larger than the sum of its proper divisors (104191).

56692721 is a wasteful number, since it uses less digits than its factorization.

56692721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104190.

The product of its digits is 45360, while the sum is 38.

The square root of 56692721 is about 7529.4568861240. The cubic root of 56692721 is about 384.1573090471.

The spelling of 56692721 in words is "fifty-six million, six hundred ninety-two thousand, seven hundred twenty-one".