640252652 has 24 divisors (see below), whose sum is σ = 1270138800. Its totient is φ = 279948096.

The previous prime is 640252651. The next prime is 640252661. The reversal of 640252652 is 256252046.

It is not an unprimeable number, because it can be changed into a prime (640252651) 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, 323027 + ... + 325002.

It is an arithmetic number, because the mean of its divisors is an integer number (52922450).

Almost surely, 2^640252652 is an apocalyptic number.

It is an amenable number.

640252652 is a deficient number, since it is larger than the sum of its proper divisors (629886148).

640252652 is a wasteful number, since it uses less digits than its factorization.

640252652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648065 (or 648063 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 640252652 is about 25303.2142622237. The cubic root of 640252652 is about 861.8872615590.

The spelling of 640252652 in words is "six hundred forty million, two hundred fifty-two thousand, six hundred fifty-two".