55408657 has 4 divisors (see below), whose sum is σ = 55652976. Its totient is φ = 55164340.

The previous prime is 55408643. The next prime is 55408667. The reversal of 55408657 is 75680455.

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 a de Polignac number, because none of the positive numbers 2^k-55408657 is a prime.

It is a super-3 number, since 3×55408657³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55408607) 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, 121819 + ... + 122272.

It is an arithmetic number, because the mean of its divisors is an integer number (13913244).

Almost surely, 2^55408657 is an apocalyptic number.

It is an amenable number.

55408657 is a deficient number, since it is larger than the sum of its proper divisors (244319).

55408657 is a wasteful number, since it uses less digits than its factorization.

55408657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244318.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 55408657 is about 7443.6991476013. The cubic root of 55408657 is about 381.2348035867.

It can be divided in two parts, 55408 and 657, that added together give a palindrome (56065).

The spelling of 55408657 in words is "fifty-five million, four hundred eight thousand, six hundred fifty-seven".