55575720 has 160 divisors (see below), whose sum is σ = 197980200. Its totient is φ = 13934592.

The previous prime is 55575719. The next prime is 55575733. The reversal of 55575720 is 2757555.

It can be written as a sum of positive squares in 4 ways, for example, as 46539684 + 9036036 = 6822^2 + 3006^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 54576 + ... + 55584.

Almost surely, 2^55575720 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 55575720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98990100).

55575720 is an abundant number, since it is smaller than the sum of its proper divisors (142404480).

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

55575720 is a wasteful number, since it uses less digits than its factorization.

55575720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 61250, while the sum is 36.

The square root of 55575720 is about 7454.9124743353. The cubic root of 55575720 is about 381.6175736537.

The spelling of 55575720 in words is "fifty-five million, five hundred seventy-five thousand, seven hundred twenty".