57398640 has 80 divisors (see below), whose sum is σ = 191633568. Its totient is φ = 14128128.

The previous prime is 57398611. The next prime is 57398641. The reversal of 57398640 is 4689375.

It is a happy number.

57398640 is nontrivially palindromic in base 11.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 57398592 and 57398601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57398641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6079 + ... + 12318.

Almost surely, 2^57398640 is an apocalyptic number.

It is an amenable number.

57398640 is an abundant number, since it is smaller than the sum of its proper divisors (134234928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57398640 is a wasteful number, since it uses less digits than its factorization.

57398640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18426 (or 18420 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 57398640 is about 7576.1890155935. The cubic root of 57398640 is about 385.7452030871.

The spelling of 57398640 in words is "fifty-seven million, three hundred ninety-eight thousand, six hundred forty".