57681689 has 4 divisors (see below), whose sum is σ = 62118756. Its totient is φ = 53244624.

The previous prime is 57681671. The next prime is 57681691. The reversal of 57681689 is 98618675.

It is a happy number.

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 25928464 + 31753225 = 5092^2 + 5635^2 .

It is a cyclic number.

It is not a de Polignac number, because 57681689 - 2²⁰ = 56633113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57681089) 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, 2218514 + ... + 2218539.

It is an arithmetic number, because the mean of its divisors is an integer number (15529689).

Almost surely, 2^57681689 is an apocalyptic number.

It is an amenable number.

57681689 is a deficient number, since it is larger than the sum of its proper divisors (4437067).

57681689 is a wasteful number, since it uses less digits than its factorization.

57681689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437066.

The product of its digits is 725760, while the sum is 50.

The square root of 57681689 is about 7594.8462130579. The cubic root of 57681689 is about 386.3782367287.

The spelling of 57681689 in words is "fifty-seven million, six hundred eighty-one thousand, six hundred eighty-nine".