640250688 has 336 divisors, whose sum is σ = 2213937152. Its totient is φ = 159667200.

The previous prime is 640250669. The next prime is 640250707. The reversal of 640250688 is 886052046.

It is an interprime number because it is at equal distance from previous prime (640250669) and next prime (640250707).

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5041281 + ... + 5041407.

Almost surely, 2^640250688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640250688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1106968576).

640250688 is an abundant number, since it is smaller than the sum of its proper divisors (1573686464).

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

640250688 is a wasteful number, since it uses less digits than its factorization.

640250688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 640250688 is about 25303.1754528952. The cubic root of 640250688 is about 861.8863802671.

The spelling of 640250688 in words is "six hundred forty million, two hundred fifty thousand, six hundred eighty-eight".