55815552 has 96 divisors (see below), whose sum is σ = 173016480. Its totient is φ = 17169408.

The previous prime is 55815533. The next prime is 55815583. The reversal of 55815552 is 25551855.

55815552 is a `hidden beast` number, since 558 + 1 + 55 + 52 = 666.

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

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13113 + ... + 16839.

It is an arithmetic number, because the mean of its divisors is an integer number (1802255).

Almost surely, 2^55815552 is an apocalyptic number.

55815552 is a gapful number since it is divisible by the number (52) 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 55815552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86508240).

55815552 is an abundant number, since it is smaller than the sum of its proper divisors (117200928).

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

55815552 is a wasteful number, since it uses less digits than its factorization.

55815552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760 (or 3745 counting only the distinct ones).

The product of its digits is 50000, while the sum is 36.

The square root of 55815552 is about 7470.9806585213. The cubic root of 55815552 is about 382.1657312903.

It can be divided in two parts, 558 and 15552, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 55815552 in words is "fifty-five million, eight hundred fifteen thousand, five hundred fifty-two".