55921686 has 32 divisors (see below), whose sum is σ = 116108640. Its totient is φ = 17934336.

The previous prime is 55921669. The next prime is 55921699. The reversal of 55921686 is 68612955.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96630 + ... + 97206.

It is an arithmetic number, because the mean of its divisors is an integer number (3628395).

Almost surely, 2^55921686 is an apocalyptic number.

55921686 is an abundant number, since it is smaller than the sum of its proper divisors (60186954).

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

55921686 is a wasteful number, since it uses less digits than its factorization.

55921686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168.

The product of its digits is 129600, while the sum is 42.

The square root of 55921686 is about 7478.0803686508. The cubic root of 55921686 is about 382.4078089577.

The spelling of 55921686 in words is "fifty-five million, nine hundred twenty-one thousand, six hundred eighty-six".