640012254 has 64 divisors (see below), whose sum is σ = 1499904000. Its totient is φ = 178265088.

The previous prime is 640012231. The next prime is 640012279. The reversal of 640012254 is 452210046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 688462 + ... + 689390.

It is an arithmetic number, because the mean of its divisors is an integer number (23436000).

Almost surely, 2^640012254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640012254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749952000).

640012254 is an abundant number, since it is smaller than the sum of its proper divisors (859891746).

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

640012254 is a wasteful number, since it uses less digits than its factorization.

640012254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 640012254 is about 25298.4634711280. The cubic root of 640012254 is about 861.7793760699.

The spelling of 640012254 in words is "six hundred forty million, twelve thousand, two hundred fifty-four".