55647920 has 20 divisors (see below), whose sum is σ = 129381600. Its totient is φ = 22259136.

The previous prime is 55647901. The next prime is 55647923. The reversal of 55647920 is 2974655.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (55647923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347720 + ... + 347879.

It is an arithmetic number, because the mean of its divisors is an integer number (6469080).

Almost surely, 2^55647920 is an apocalyptic number.

It is an amenable number.

55647920 is an abundant number, since it is smaller than the sum of its proper divisors (73733680).

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

55647920 is a wasteful number, since it uses less digits than its factorization.

55647920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695612 (or 695606 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 55647920 is about 7459.7533471288. The cubic root of 55647920 is about 381.7827588934.

The spelling of 55647920 in words is "fifty-five million, six hundred forty-seven thousand, nine hundred twenty".