640708030 has 16 divisors (see below), whose sum is σ = 1153751760. Its totient is φ = 256177152.

The previous prime is 640708027. The next prime is 640708067. The reversal of 640708030 is 30807046.

It is a self number, because there is not a number n which added to its sum of digits gives 640708030.

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, 14977 + ... + 38803.

It is an arithmetic number, because the mean of its divisors is an integer number (72109485).

Almost surely, 2^640708030 is an apocalyptic number.

640708030 is a deficient number, since it is larger than the sum of its proper divisors (513043730).

640708030 is a wasteful number, since it uses less digits than its factorization.

640708030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26523.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 640708030 is about 25312.2110847709. The cubic root of 640708030 is about 862.0915514757.

The spelling of 640708030 in words is "six hundred forty million, seven hundred eight thousand, thirty".