640452612 has 24 divisors (see below), whose sum is σ = 1503912256. Its totient is φ = 212123808.

The previous prime is 640452607. The next prime is 640452613. The reversal of 640452612 is 216254046.

It is a self number, because there is not a number n which added to its sum of digits gives 640452612.

It is not an unprimeable number, because it can be changed into a prime (640452613) 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, 168088 + ... + 171855.

Almost surely, 2^640452612 is an apocalyptic number.

It is an amenable number.

640452612 is an abundant number, since it is smaller than the sum of its proper divisors (863459644).

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

640452612 is a wasteful number, since it uses less digits than its factorization.

640452612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340107 (or 340105 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 640452612 is about 25307.1652304244. The cubic root of 640452612 is about 861.9769787655.

The spelling of 640452612 in words is "six hundred forty million, four hundred fifty-two thousand, six hundred twelve".