55518480 has 80 divisors (see below), whose sum is σ = 191237760. Its totient is φ = 14804352.

The previous prime is 55518473. The next prime is 55518493. The reversal of 55518480 is 8481555.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10692 + ... + 15011.

It is an arithmetic number, because the mean of its divisors is an integer number (2390472).

Almost surely, 2^55518480 is an apocalyptic number.

It is an amenable number.

55518480 is an abundant number, since it is smaller than the sum of its proper divisors (135719280).

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

55518480 is a wasteful number, since it uses less digits than its factorization.

55518480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25725 (or 25713 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 55518480 is about 7451.0724060366. The cubic root of 55518480 is about 381.4865134622.

The spelling of 55518480 in words is "fifty-five million, five hundred eighteen thousand, four hundred eighty".