57728523220 has 24 divisors (see below), whose sum is σ = 121347299304. Its totient is φ = 23069047296.

The previous prime is 57728523163. The next prime is 57728523221. The reversal of 57728523220 is 2232582775.

It can be written as a sum of positive squares in 4 ways, for example, as 27523473604 + 30205049616 = 165902^2 + 173796^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57728523221) 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, 1376449 + ... + 1417768.

It is an arithmetic number, because the mean of its divisors is an integer number (5056137471).

Almost surely, 2^57728523220 is an apocalyptic number.

It is an amenable number.

57728523220 is an abundant number, since it is smaller than the sum of its proper divisors (63618776084).

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

57728523220 is a wasteful number, since it uses less digits than its factorization.

57728523220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795259 (or 2795257 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 43.

The spelling of 57728523220 in words is "fifty-seven billion, seven hundred twenty-eight million, five hundred twenty-three thousand, two hundred twenty".