55220664 has 16 divisors (see below), whose sum is σ = 138051720. Its totient is φ = 18406880.

The previous prime is 55220657. The next prime is 55220713. The reversal of 55220664 is 46602255.

55220664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150407 + ... + 1150454.

Almost surely, 2^55220664 is an apocalyptic number.

It is an amenable number.

55220664 is an abundant number, since it is smaller than the sum of its proper divisors (82831056).

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

55220664 is a wasteful number, since it uses less digits than its factorization.

55220664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300870 (or 2300866 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 55220664 is about 7431.0607587342. The cubic root of 55220664 is about 380.8031581488.

The spelling of 55220664 in words is "fifty-five million, two hundred twenty thousand, six hundred sixty-four".