640498084 has 24 divisors (see below), whose sum is σ = 1140758528. Its totient is φ = 314616960.

The previous prime is 640498039. The next prime is 640498129. The reversal of 640498084 is 480894046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (640498039) and next prime (640498129).

It is a self number, because there is not a number n which added to its sum of digits gives 640498084.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46204 + ... + 58444.

Almost surely, 2^640498084 is an apocalyptic number.

It is an amenable number.

640498084 is a deficient number, since it is larger than the sum of its proper divisors (500260444).

640498084 is a wasteful number, since it uses less digits than its factorization.

640498084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12475 (or 12473 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 640498084 is about 25308.0636161679. The cubic root of 640498084 is about 861.9973783438.

The spelling of 640498084 in words is "six hundred forty million, four hundred ninety-eight thousand, eighty-four".