640970140 has 24 divisors (see below), whose sum is σ = 1358390880. Its totient is φ = 254035008.

The previous prime is 640970131. The next prime is 640970153. The reversal of 640970140 is 41079046.

640970140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144832 + ... + 149191.

It is an arithmetic number, because the mean of its divisors is an integer number (56599620).

Almost surely, 2^640970140 is an apocalyptic number.

It is an amenable number.

640970140 is an abundant number, since it is smaller than the sum of its proper divisors (717420740).

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

640970140 is a wasteful number, since it uses less digits than its factorization.

640970140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294141 (or 294139 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 640970140 is about 25317.3880959312. The cubic root of 640970140 is about 862.2090943604.

The spelling of 640970140 in words is "six hundred forty million, nine hundred seventy thousand, one hundred forty".