55649668 has 12 divisors (see below), whose sum is σ = 97932240. Its totient is φ = 27669032.

The previous prime is 55649663. The next prime is 55649677. The reversal of 55649668 is 86694655.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55649663) 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, 38146 + ... + 39577.

It is an arithmetic number, because the mean of its divisors is an integer number (8161020).

Almost surely, 2^55649668 is an apocalyptic number.

It is an amenable number.

55649668 is a deficient number, since it is larger than the sum of its proper divisors (42282572).

55649668 is a wasteful number, since it uses less digits than its factorization.

55649668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77906 (or 77904 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 49.

The square root of 55649668 is about 7459.8705082595. The cubic root of 55649668 is about 381.7867563430.

The spelling of 55649668 in words is "fifty-five million, six hundred forty-nine thousand, six hundred sixty-eight".