57243640 has 32 divisors (see below), whose sum is σ = 129150000. Its totient is φ = 22834944.

The previous prime is 57243623. The next prime is 57243649. The reversal of 57243640 is 4634275.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57243649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14611 + ... + 18109.

Almost surely, 2^57243640 is an apocalyptic number.

It is an amenable number.

57243640 is an abundant number, since it is smaller than the sum of its proper divisors (71906360).

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

57243640 is a wasteful number, since it uses less digits than its factorization.

57243640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919 (or 3915 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 57243640 is about 7565.9526829078. The cubic root of 57243640 is about 385.3976663566.

The spelling of 57243640 in words is "fifty-seven million, two hundred forty-three thousand, six hundred forty".