55731520 has 56 divisors (see below), whose sum is σ = 142929864. Its totient is φ = 20576256.

The previous prime is 55731449. The next prime is 55731523. The reversal of 55731520 is 2513755.

It can be written as a sum of positive squares in 4 ways, for example, as 1679616 + 54051904 = 1296^2 + 7352^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55731523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2539 + ... + 10858.

It is an arithmetic number, because the mean of its divisors is an integer number (2552319).

Almost surely, 2^55731520 is an apocalyptic number.

It is an amenable number.

55731520 is an abundant number, since it is smaller than the sum of its proper divisors (87198344).

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

55731520 is a wasteful number, since it uses less digits than its factorization.

55731520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13427 (or 13417 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 55731520 is about 7465.3546466327. The cubic root of 55731520 is about 381.9738476107.

The spelling of 55731520 in words is "fifty-five million, seven hundred thirty-one thousand, five hundred twenty".