640107545 has 72 divisors (see below), whose sum is σ = 1026981312. Its totient is φ = 374837760.

The previous prime is 640107487. The next prime is 640107563. The reversal of 640107545 is 545701046.

It is not a de Polignac number, because 640107545 - 2¹⁶ = 640042009 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1223654 + ... + 1224176.

Almost surely, 2^640107545 is an apocalyptic number.

It is an amenable number.

640107545 is a deficient number, since it is larger than the sum of its proper divisors (386873767).

640107545 is a wasteful number, since it uses less digits than its factorization.

640107545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 640107545 is about 25300.3467367544. The cubic root of 640107545 is about 861.8221438673.

The spelling of 640107545 in words is "six hundred forty million, one hundred seven thousand, five hundred forty-five".