55887720 has 64 divisors (see below), whose sum is σ = 191617920. Its totient is φ = 12774144.

The previous prime is 55887673. The next prime is 55887731. The reversal of 55887720 is 2778855.

It is a happy number.

55887720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32427 + ... + 34106.

It is an arithmetic number, because the mean of its divisors is an integer number (2994030).

Almost surely, 2^55887720 is an apocalyptic number.

It is an amenable number.

55887720 is an abundant number, since it is smaller than the sum of its proper divisors (135730200).

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

55887720 is a wasteful number, since it uses less digits than its factorization.

55887720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66554 (or 66550 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 55887720 is about 7475.8089863238. The cubic root of 55887720 is about 382.3303703395.

The spelling of 55887720 in words is "fifty-five million, eight hundred eighty-seven thousand, seven hundred twenty".