640924662 has 16 divisors (see below), whose sum is σ = 1464970752. Its totient is φ = 183121320.

The previous prime is 640924651. The next prime is 640924703. The reversal of 640924662 is 266429046.

It is a self number, because there is not a number n which added to its sum of digits gives 640924662.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7630014 + ... + 7630097.

It is an arithmetic number, because the mean of its divisors is an integer number (91560672).

Almost surely, 2^640924662 is an apocalyptic number.

640924662 is an abundant number, since it is smaller than the sum of its proper divisors (824046090).

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

640924662 is a wasteful number, since it uses less digits than its factorization.

640924662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15260123.

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 640924662 is about 25316.4899225781. The cubic root of 640924662 is about 862.1887021090.

The spelling of 640924662 in words is "six hundred forty million, nine hundred twenty-four thousand, six hundred sixty-two".