56500721 has 8 divisors (see below), whose sum is σ = 58437120. Its totient is φ = 54595008.

The previous prime is 56500711. The next prime is 56500723. The reversal of 56500721 is 12700565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56500721 - 2¹⁸ = 56238577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56500723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3896 + ... + 11321.

It is an arithmetic number, because the mean of its divisors is an integer number (7304640).

Almost surely, 2^56500721 is an apocalyptic number.

It is an amenable number.

56500721 is a deficient number, since it is larger than the sum of its proper divisors (1936399).

56500721 is a wasteful number, since it uses less digits than its factorization.

56500721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15343.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 56500721 is about 7516.6961492400. The cubic root of 56500721 is about 383.7231461649.

The spelling of 56500721 in words is "fifty-six million, five hundred thousand, seven hundred twenty-one".