55988820 has 240 divisors, whose sum is σ = 197588160. Its totient is φ = 13188096.

The previous prime is 55988809. The next prime is 55988827. The reversal of 55988820 is 2888955.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55988827) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 523207 + ... + 523313.

It is an arithmetic number, because the mean of its divisors is an integer number (823284).

Almost surely, 2^55988820 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 55988820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98794080).

55988820 is an abundant number, since it is smaller than the sum of its proper divisors (141599340).

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

55988820 is a wasteful number, since it uses less digits than its factorization.

55988820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 55988820 is about 7482.5677410900. The cubic root of 55988820 is about 382.5607746569.

The spelling of 55988820 in words is "fifty-five million, nine hundred eighty-eight thousand, eight hundred twenty".