640323418 has 8 divisors (see below), whose sum is σ = 1097697312. Its totient is φ = 274424316.

The previous prime is 640323413. The next prime is 640323421. The reversal of 640323418 is 814323046.

640323418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 640323418.

It is not an unprimeable number, because it can be changed into a prime (640323413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22868680 + ... + 22868707.

It is an arithmetic number, because the mean of its divisors is an integer number (137212164).

Almost surely, 2^640323418 is an apocalyptic number.

640323418 is a deficient number, since it is larger than the sum of its proper divisors (457373894).

640323418 is a wasteful number, since it uses less digits than its factorization.

640323418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45737396.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 640323418 is about 25304.6125834797. The cubic root of 640323418 is about 861.9190146837.

The spelling of 640323418 in words is "six hundred forty million, three hundred twenty-three thousand, four hundred eighteen".