57739821 has 12 divisors (see below), whose sum is σ = 80481408. Its totient is φ = 36818584.

The previous prime is 57739811. The next prime is 57739823. The reversal of 57739821 is 12893775.

It is not a de Polignac number, because 57739821 - 2¹¹ = 57737773 is a prime.

It is a super-2 number, since 2×57739821² = 6667773858224082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57739823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16605 + ... + 19778.

It is an arithmetic number, because the mean of its divisors is an integer number (6706784).

Almost surely, 2^57739821 is an apocalyptic number.

It is an amenable number.

57739821 is a deficient number, since it is larger than the sum of its proper divisors (22741587).

57739821 is a wasteful number, since it uses less digits than its factorization.

57739821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36432 (or 36409 counting only the distinct ones).

The product of its digits is 105840, while the sum is 42.

The square root of 57739821 is about 7598.6723182409. The cubic root of 57739821 is about 386.5079913576.

The spelling of 57739821 in words is "fifty-seven million, seven hundred thirty-nine thousand, eight hundred twenty-one".