56640789 has 20 divisors (see below), whose sum is σ = 88293216. Its totient is φ = 36117576.

The previous prime is 56640763. The next prime is 56640797. The reversal of 56640789 is 98704665.

56640789 is a `hidden beast` number, since 566 + 4 + 0 + 7 + 89 = 666.

It is not a de Polignac number, because 56640789 - 2⁸ = 56640533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56640739) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13339 + ... + 17064.

Almost surely, 2^56640789 is an apocalyptic number.

It is an amenable number.

56640789 is a deficient number, since it is larger than the sum of its proper divisors (31652427).

56640789 is a wasteful number, since it uses less digits than its factorization.

56640789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30438 (or 30429 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 56640789 is about 7526.0075073043. The cubic root of 56640789 is about 384.0399738660.

The spelling of 56640789 in words is "fifty-six million, six hundred forty thousand, seven hundred eighty-nine".