56069721 has 12 divisors (see below), whose sum is σ = 82873648. Its totient is φ = 36510264.

The previous prime is 56069701. The next prime is 56069729. The reversal of 56069721 is 12796065.

56069721 is a `hidden beast` number, since 560 + 6 + 97 + 2 + 1 = 666.

It is not a de Polignac number, because 56069721 - 2⁷ = 56069593 is a prime.

It is a super-2 number, since 2×56069721² = 6287627226035682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56069729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72055 + ... + 72828.

Almost surely, 2^56069721 is an apocalyptic number.

It is an amenable number.

56069721 is a deficient number, since it is larger than the sum of its proper divisors (26803927).

56069721 is a wasteful number, since it uses less digits than its factorization.

56069721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144932 (or 144929 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 56069721 is about 7487.9717547544. The cubic root of 56069721 is about 382.7449462727.

The spelling of 56069721 in words is "fifty-six million, sixty-nine thousand, seven hundred twenty-one".