640140070 has 8 divisors (see below), whose sum is σ = 1152252144. Its totient is φ = 256056024.

The previous prime is 640140041. The next prime is 640140091. The reversal of 640140070 is 70041046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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, 32006994 + ... + 32007013.

It is an arithmetic number, because the mean of its divisors is an integer number (144031518).

Almost surely, 2^640140070 is an apocalyptic number.

640140070 is a deficient number, since it is larger than the sum of its proper divisors (512112074).

640140070 is a wasteful number, since it uses less digits than its factorization.

640140070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64014014.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 640140070 is about 25300.9895063414. The cubic root of 640140070 is about 861.8367405241.

The spelling of 640140070 in words is "six hundred forty million, one hundred forty thousand, seventy".