640183730 has 16 divisors (see below), whose sum is σ = 1154939904. Its totient is φ = 255493680.

The previous prime is 640183721. The next prime is 640183763. The reversal of 640183730 is 37381046.

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, 67826 + ... + 76685.

It is an arithmetic number, because the mean of its divisors is an integer number (72183744).

Almost surely, 2^640183730 is an apocalyptic number.

640183730 is a deficient number, since it is larger than the sum of its proper divisors (514756174).

640183730 is a wasteful number, since it uses less digits than its factorization.

640183730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144961.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 640183730 is about 25301.8523037346. The cubic root of 640183730 is about 861.8563335988.

The spelling of 640183730 in words is "six hundred forty million, one hundred eighty-three thousand, seven hundred thirty".