55057856 has 56 divisors (see below), whose sum is σ = 127040640. Its totient is φ = 23185152.

The previous prime is 55057823. The next prime is 55057861. The reversal of 55057856 is 65875055.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25391 + ... + 27473.

Almost surely, 2^55057856 is an apocalyptic number.

55057856 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 55057856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63520320).

55057856 is an abundant number, since it is smaller than the sum of its proper divisors (71982784).

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

55057856 is a wasteful number, since it uses less digits than its factorization.

55057856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161 (or 2151 counting only the distinct ones).

The product of its (nonzero) digits is 210000, while the sum is 41.

The square root of 55057856 is about 7420.0981125589. The cubic root of 55057856 is about 380.4285469931.

The spelling of 55057856 in words is "fifty-five million, fifty-seven thousand, eight hundred fifty-six".