57657981 has 8 divisors (see below), whose sum is σ = 76978144. Its totient is φ = 38388240.

The previous prime is 57657979. The next prime is 57657997. The reversal of 57657981 is 18975675.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 57657981 - 2¹ = 57657979 is a prime.

It is a super-2 number, since 2×57657981² = 6648885545992722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57657981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57657181) 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, 9850 + ... + 14571.

It is an arithmetic number, because the mean of its divisors is an integer number (9622268).

Almost surely, 2^57657981 is an apocalyptic number.

It is an amenable number.

57657981 is a deficient number, since it is larger than the sum of its proper divisors (19320163).

57657981 is a wasteful number, since it uses less digits than its factorization.

57657981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25211.

The product of its digits is 529200, while the sum is 48.

The square root of 57657981 is about 7593.2852573837. The cubic root of 57657981 is about 386.3252938123.

The spelling of 57657981 in words is "fifty-seven million, six hundred fifty-seven thousand, nine hundred eighty-one".