53561520 has 160 divisors (see below), whose sum is σ = 186863040. Its totient is φ = 14100480.

The previous prime is 53561507. The next prime is 53561567. The reversal of 53561520 is 2516535.

53561520 is a `hidden beast` number, since 53 + 561 + 52 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295830 + ... + 296010.

It is an arithmetic number, because the mean of its divisors is an integer number (1167894).

Almost surely, 2^53561520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53561520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93431520).

53561520 is an abundant number, since it is smaller than the sum of its proper divisors (133301520).

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

53561520 is a wasteful number, since it uses less digits than its factorization.

53561520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 53561520 is about 7318.5736315214. The cubic root of 53561520 is about 376.9504774451.

The spelling of 53561520 in words is "fifty-three million, five hundred sixty-one thousand, five hundred twenty".