55631856 has 160 divisors (see below), whose sum is σ = 174592000. Its totient is φ = 15240960.

The previous prime is 55631839. The next prime is 55631861. The reversal of 55631856 is 65813655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 510330 + ... + 510438.

It is an arithmetic number, because the mean of its divisors is an integer number (1091200).

Almost surely, 2^55631856 is an apocalyptic number.

55631856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55631856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87296000).

55631856 is an abundant number, since it is smaller than the sum of its proper divisors (118960144).

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

55631856 is a wasteful number, since it uses less digits than its factorization.

55631856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 152 counting only the distinct ones).

The product of its digits is 108000, while the sum is 39.

The square root of 55631856 is about 7458.6765582106. The cubic root of 55631856 is about 381.7460186854.

The spelling of 55631856 in words is "fifty-five million, six hundred thirty-one thousand, eight hundred fifty-six".