55731840 has 64 divisors (see below), whose sum is σ = 177651360. Its totient is φ = 14861312.

The previous prime is 55731839. The next prime is 55731869. The reversal of 55731840 is 4813755.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12594 + ... + 16433.

Almost surely, 2^55731840 is an apocalyptic number.

It is an amenable number.

55731840 is an abundant number, since it is smaller than the sum of its proper divisors (121919520).

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

55731840 is a wasteful number, since it uses less digits than its factorization.

55731840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29049 (or 29037 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 55731840 is about 7465.3760789394. The cubic root of 55731840 is about 381.9745786835.

The spelling of 55731840 in words is "fifty-five million, seven hundred thirty-one thousand, eight hundred forty".