55403664 has 20 divisors (see below), whose sum is σ = 143126256. Its totient is φ = 18467872.

The previous prime is 55403653. The next prime is 55403671. The reversal of 55403664 is 46630455.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577074 + ... + 577169.

Almost surely, 2^55403664 is an apocalyptic number.

It is an amenable number.

55403664 is an abundant number, since it is smaller than the sum of its proper divisors (87722592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55403664 is a wasteful number, since it uses less digits than its factorization.

55403664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154254 (or 1154248 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 55403664 is about 7443.3637557223. The cubic root of 55403664 is about 381.2233519312.

The spelling of 55403664 in words is "fifty-five million, four hundred three thousand, six hundred sixty-four".