640857576 has 32 divisors (see below), whose sum is σ = 1602807840. Its totient is φ = 213530688.

The previous prime is 640857541. The next prime is 640857577. The reversal of 640857576 is 675758046.

640857576 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (640857577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81615 + ... + 89121.

It is an arithmetic number, because the mean of its divisors is an integer number (50087745).

Almost surely, 2^640857576 is an apocalyptic number.

It is an amenable number.

640857576 is an abundant number, since it is smaller than the sum of its proper divisors (961950264).

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

640857576 is a wasteful number, since it uses less digits than its factorization.

640857576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11073 (or 11069 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 48.

The square root of 640857576 is about 25315.1649411968. The cubic root of 640857576 is about 862.1586191092.

The spelling of 640857576 in words is "six hundred forty million, eight hundred fifty-seven thousand, five hundred seventy-six".