55871690 has 64 divisors (see below), whose sum is σ = 125971200. Its totient is φ = 17396736.

The previous prime is 55871653. The next prime is 55871701. The reversal of 55871690 is 9617855.

It is a super-2 number, since 2×55871690² = 6243291486912200, which contains 22 as substring.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 33701 + ... + 35319.

It is an arithmetic number, because the mean of its divisors is an integer number (1968300).

Almost surely, 2^55871690 is an apocalyptic number.

55871690 is an abundant number, since it is smaller than the sum of its proper divisors (70099510).

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

55871690 is a wasteful number, since it uses less digits than its factorization.

55871690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 55871690 is about 7474.7367846634. The cubic root of 55871690 is about 382.2938128639.

The spelling of 55871690 in words is "fifty-five million, eight hundred seventy-one thousand, six hundred ninety".