640030270 has 16 divisors (see below), whose sum is σ = 1256786928. Its totient is φ = 232738240.

The previous prime is 640030249. The next prime is 640030283. The reversal of 640030270 is 72030046.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 2909119 + ... + 2909338.

It is an arithmetic number, because the mean of its divisors is an integer number (78549183).

Almost surely, 2^640030270 is an apocalyptic number.

640030270 is a deficient number, since it is larger than the sum of its proper divisors (616756658).

640030270 is a wasteful number, since it uses less digits than its factorization.

640030270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5818475.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 640030270 is about 25298.8195376780. The cubic root of 640030270 is about 861.7874622023.

The spelling of 640030270 in words is "six hundred forty million, thirty thousand, two hundred seventy".