57520681 has 4 divisors (see below), whose sum is σ = 59075332. Its totient is φ = 55966032.

The previous prime is 57520669. The next prime is 57520747. The reversal of 57520681 is 18602575.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37405456 + 20115225 = 6116^2 + 4485^2 .

It is a cyclic number.

It is not a de Polignac number, because 57520681 - 2⁵ = 57520649 is a prime.

It is a super-2 number, since 2×57520681² = 6617257485407522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57520481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777270 + ... + 777343.

It is an arithmetic number, because the mean of its divisors is an integer number (14768833).

Almost surely, 2^57520681 is an apocalyptic number.

It is an amenable number.

57520681 is a deficient number, since it is larger than the sum of its proper divisors (1554651).

57520681 is a wasteful number, since it uses less digits than its factorization.

57520681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554650.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 57520681 is about 7584.2389862134. The cubic root of 57520681 is about 386.0184000643.

The spelling of 57520681 in words is "fifty-seven million, five hundred twenty thousand, six hundred eighty-one".