55657390 has 16 divisors (see below), whose sum is σ = 101557008. Its totient is φ = 21957696.

The previous prime is 55657379. The next prime is 55657391. The reversal of 55657390 is 9375655.

55657390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55657390² = 6195490123224200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55657391) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 37392 + ... + 38851.

It is an arithmetic number, because the mean of its divisors is an integer number (6347313).

Almost surely, 2^55657390 is an apocalyptic number.

55657390 is a deficient number, since it is larger than the sum of its proper divisors (45899618).

55657390 is a wasteful number, since it uses less digits than its factorization.

55657390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76323.

The product of its (nonzero) digits is 141750, while the sum is 40.

The square root of 55657390 is about 7460.3880596119. The cubic root of 55657390 is about 381.8044145555.

The spelling of 55657390 in words is "fifty-five million, six hundred fifty-seven thousand, three hundred ninety".