55487820 has 48 divisors (see below), whose sum is σ = 158306400. Its totient is φ = 14516736.

The previous prime is 55487807. The next prime is 55487821. The reversal of 55487820 is 2878455.

It is not an unprimeable number, because it can be changed into a prime (55487821) 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, 5545 + ... + 11904.

It is an arithmetic number, because the mean of its divisors is an integer number (3298050).

Almost surely, 2^55487820 is an apocalyptic number.

It is an amenable number.

55487820 is an abundant number, since it is smaller than the sum of its proper divisors (102818580).

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

55487820 is a wasteful number, since it uses less digits than its factorization.

55487820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17514 (or 17512 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 55487820 is about 7449.0146999452. The cubic root of 55487820 is about 381.4162754065.

The spelling of 55487820 in words is "fifty-five million, four hundred eighty-seven thousand, eight hundred twenty".