640105572 has 12 divisors (see below), whose sum is σ = 1493579696. Its totient is φ = 213368520.

The previous prime is 640105567. The next prime is 640105591. The reversal of 640105572 is 275501046.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26671054 + ... + 26671077.

Almost surely, 2^640105572 is an apocalyptic number.

It is an amenable number.

640105572 is an abundant number, since it is smaller than the sum of its proper divisors (853474124).

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

640105572 is a wasteful number, since it uses less digits than its factorization.

640105572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53342138 (or 53342136 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 640105572 is about 25300.3077451639. The cubic root of 640105572 is about 861.8212584032.

The spelling of 640105572 in words is "six hundred forty million, one hundred five thousand, five hundred seventy-two".