55811808 has 96 divisors (see below), whose sum is σ = 175341600. Its totient is φ = 17169408.

The previous prime is 55811803. The next prime is 55811837. The reversal of 55811808 is 80811855.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×55811808² = 6229915824457728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55811803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8748 + ... + 13716.

It is an arithmetic number, because the mean of its divisors is an integer number (1826475).

Almost surely, 2^55811808 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 55811808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87670800).

55811808 is an abundant number, since it is smaller than the sum of its proper divisors (119529792).

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

55811808 is a wasteful number, since it uses less digits than its factorization.

55811808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001 (or 4987 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 36.

The square root of 55811808 is about 7470.7300848043. The cubic root of 55811808 is about 382.1571861182.

The spelling of 55811808 in words is "fifty-five million, eight hundred eleven thousand, eight hundred eight".