640898592 has 48 divisors (see below), whose sum is σ = 1710888480. Its totient is φ = 210010112.

The previous prime is 640898591. The next prime is 640898603. The reversal of 640898592 is 295898046.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (640898591) 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, 50913 + ... + 62240.

It is an arithmetic number, because the mean of its divisors is an integer number (35643510).

Almost surely, 2^640898592 is an apocalyptic number.

It is an amenable number.

640898592 is an abundant number, since it is smaller than the sum of its proper divisors (1069989888).

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

640898592 is a wasteful number, since it uses less digits than its factorization.

640898592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113225 (or 113217 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The square root of 640898592 is about 25315.9750355383. The cubic root of 640898592 is about 862.1770119341.

The spelling of 640898592 in words is "six hundred forty million, eight hundred ninety-eight thousand, five hundred ninety-two".