55865856 has 80 divisors (see below), whose sum is σ = 153008064. Its totient is φ = 18100224.

The previous prime is 55865839. The next prime is 55865857. The reversal of 55865856 is 65856855.

It is a super-2 number, since 2×55865856² = 6241987733225472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (55865857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56341 + ... + 57323.

Almost surely, 2^55865856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55865856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76504032).

55865856 is an abundant number, since it is smaller than the sum of its proper divisors (97142208).

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

55865856 is an equidigital number, since it uses as much as digits as its factorization.

55865856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041 (or 1025 counting only the distinct ones).

The product of its digits is 1440000, while the sum is 48.

The square root of 55865856 is about 7474.3465266202. The cubic root of 55865856 is about 382.2805063054.

Subtracting 55865856 from its reverse (65856855), we obtain a palindrome (9990999).

The spelling of 55865856 in words is "fifty-five million, eight hundred sixty-five thousand, eight hundred fifty-six".