640453264 has 40 divisors (see below), whose sum is σ = 1365707232. Its totient is φ = 288529920.

The previous prime is 640453249. The next prime is 640453283. The reversal of 640453264 is 462354046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3787 + ... + 35989.

Almost surely, 2^640453264 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 640453264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682853616).

640453264 is an abundant number, since it is smaller than the sum of its proper divisors (725253968).

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

640453264 is a wasteful number, since it uses less digits than its factorization.

640453264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32335 (or 32329 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 640453264 is about 25307.1781121483. The cubic root of 640453264 is about 861.9772712716.

The spelling of 640453264 in words is "six hundred forty million, four hundred fifty-three thousand, two hundred sixty-four".