56639993 has 8 divisors (see below), whose sum is σ = 57120000. Its totient is φ = 56162448.

The previous prime is 56639981. The next prime is 56640011. The reversal of 56639993 is 39993665.

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 56639993 - 2¹⁰ = 56638969 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 (56639923) 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, 111023 + ... + 111531.

It is an arithmetic number, because the mean of its divisors is an integer number (7140000).

Almost surely, 2^56639993 is an apocalyptic number.

It is an amenable number.

56639993 is a deficient number, since it is larger than the sum of its proper divisors (480007).

56639993 is a wasteful number, since it uses less digits than its factorization.

56639993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231.

The product of its digits is 1180980, while the sum is 50.

The square root of 56639993 is about 7525.9546238334. The cubic root of 56639993 is about 384.0381748253.

The spelling of 56639993 in words is "fifty-six million, six hundred thirty-nine thousand, nine hundred ninety-three".