640563246 has 24 divisors (see below), whose sum is σ = 1389659544. Its totient is φ = 213248400.

The previous prime is 640563239. The next prime is 640563251. The reversal of 640563246 is 642365046.

640563246 is a `hidden beast` number, since 6 + 405 + 6 + 3 + 246 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 640563246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7980 + ... + 36671.

It is an arithmetic number, because the mean of its divisors is an integer number (57902481).

Almost surely, 2^640563246 is an apocalyptic number.

640563246 is an abundant number, since it is smaller than the sum of its proper divisors (749096298).

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

640563246 is a wasteful number, since it uses less digits than its factorization.

640563246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45456 (or 45453 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 640563246 is about 25309.3509596750. The cubic root of 640563246 is about 862.0266095363.

The spelling of 640563246 in words is "six hundred forty million, five hundred sixty-three thousand, two hundred forty-six".