56766389 has 4 divisors (see below), whose sum is σ = 57297024. Its totient is φ = 56235756.

The previous prime is 56766379. The next prime is 56766419. The reversal of 56766389 is 98366765.

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 56766389 - 2⁴ = 56766373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56766329) 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, 265157 + ... + 265370.

It is an arithmetic number, because the mean of its divisors is an integer number (14324256).

Almost surely, 2^56766389 is an apocalyptic number.

It is an amenable number.

56766389 is a deficient number, since it is larger than the sum of its proper divisors (530635).

56766389 is a wasteful number, since it uses less digits than its factorization.

56766389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530634.

The product of its digits is 1632960, while the sum is 50.

The square root of 56766389 is about 7534.3472842709. The cubic root of 56766389 is about 384.3236317015.

The spelling of 56766389 in words is "fifty-six million, seven hundred sixty-six thousand, three hundred eighty-nine".