55724009 has 12 divisors (see below), whose sum is σ = 63916608. Its totient is φ = 48453240.

The previous prime is 55723973. The next prime is 55724027. The reversal of 55724009 is 90042755.

It is not a de Polignac number, because 55724009 - 2⁸ = 55723753 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 (55724509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7229 + ... + 12794.

It is an arithmetic number, because the mean of its divisors is an integer number (5326384).

Almost surely, 2^55724009 is an apocalyptic number.

It is an amenable number.

55724009 is a deficient number, since it is larger than the sum of its proper divisors (8192599).

55724009 is a wasteful number, since it uses less digits than its factorization.

55724009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20068 (or 20057 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 55724009 is about 7464.8515725365. The cubic root of 55724009 is about 381.9566871572.

The spelling of 55724009 in words is "fifty-five million, seven hundred twenty-four thousand, nine".