55640790 has 32 divisors (see below), whose sum is σ = 148376160. Its totient is φ = 14837472.

The previous prime is 55640789. The next prime is 55640801. The reversal of 55640790 is 9704655.

55640790 is a `hidden beast` number, since 5 + 5 + 640 + 7 + 9 + 0 = 666.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 102769 + ... + 103308.

It is an arithmetic number, because the mean of its divisors is an integer number (4636755).

Almost surely, 2^55640790 is an apocalyptic number.

55640790 is an abundant number, since it is smaller than the sum of its proper divisors (92735370).

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

55640790 is a wasteful number, since it uses less digits than its factorization.

55640790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206093 (or 206087 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 55640790 is about 7459.2754339815. The cubic root of 55640790 is about 381.7664526395.

The spelling of 55640790 in words is "fifty-five million, six hundred forty thousand, seven hundred ninety".