57239649 has 32 divisors (see below), whose sum is σ = 89913600. Its totient is φ = 35925120.

The previous prime is 57239627. The next prime is 57239653. The reversal of 57239649 is 94693275.

It is a happy number.

57239649 is a `hidden beast` number, since 572 + 39 + 6 + 49 = 666.

It is not a de Polignac number, because 57239649 - 2⁹ = 57239137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57239659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31212 + ... + 32994.

It is an arithmetic number, because the mean of its divisors is an integer number (2809800).

Almost surely, 2^57239649 is an apocalyptic number.

It is an amenable number.

57239649 is a deficient number, since it is larger than the sum of its proper divisors (32673951).

57239649 is a wasteful number, since it uses less digits than its factorization.

57239649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862 (or 1856 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 57239649 is about 7565.6889309567. The cubic root of 57239649 is about 385.3887095663.

The spelling of 57239649 in words is "fifty-seven million, two hundred thirty-nine thousand, six hundred forty-nine".