57897781 has 4 divisors (see below), whose sum is σ = 59309964. Its totient is φ = 56485600.

The previous prime is 57897773. The next prime is 57897799. The reversal of 57897781 is 18779875.

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 2692881 + 55204900 = 1641^2 + 7430^2 .

It is a cyclic number.

It is not a de Polignac number, because 57897781 - 2³ = 57897773 is a prime.

It is a super-2 number, since 2×57897781² = 6704306089447922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57897701) 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, 706030 + ... + 706111.

It is an arithmetic number, because the mean of its divisors is an integer number (14827491).

Almost surely, 2^57897781 is an apocalyptic number.

It is an amenable number.

57897781 is a deficient number, since it is larger than the sum of its proper divisors (1412183).

57897781 is a wasteful number, since it uses less digits than its factorization.

57897781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412182.

The product of its digits is 987840, while the sum is 52.

The square root of 57897781 is about 7609.0591402617. The cubic root of 57897781 is about 386.8601296870.

The spelling of 57897781 in words is "fifty-seven million, eight hundred ninety-seven thousand, seven hundred eighty-one".