56866509 has 48 divisors (see below), whose sum is σ = 99973440. Its totient is φ = 31842720.

The previous prime is 56866507. The next prime is 56866517. The reversal of 56866509 is 90566865.

It is not a de Polignac number, because 56866509 - 2¹ = 56866507 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56866507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69714 + ... + 70524.

It is an arithmetic number, because the mean of its divisors is an integer number (2082780).

Almost surely, 2^56866509 is an apocalyptic number.

It is an amenable number.

56866509 is a deficient number, since it is larger than the sum of its proper divisors (43106931).

56866509 is a wasteful number, since it uses less digits than its factorization.

56866509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 874 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 56866509 is about 7540.9885956683. The cubic root of 56866509 is about 384.5494453861.

It can be divided in two parts, 56866 and 509, that added together give a palindrome (57375).

The spelling of 56866509 in words is "fifty-six million, eight hundred sixty-six thousand, five hundred nine".