640120319 has 8 divisors (see below), whose sum is σ = 649902960. Its totient is φ = 630387136.

The previous prime is 640120237. The next prime is 640120339. The reversal of 640120319 is 913021046.

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

It is a cyclic number.

It is not a de Polignac number, because 640120319 - 2²⁴ = 623343103 is a prime.

It is a super-2 number, since 2×640120319² = 819508045593323522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640120339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14147 + ... + 38475.

It is an arithmetic number, because the mean of its divisors is an integer number (81237870).

Almost surely, 2^640120319 is an apocalyptic number.

640120319 is a deficient number, since it is larger than the sum of its proper divisors (9782641).

640120319 is a wasteful number, since it uses less digits than its factorization.

640120319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24729.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 640120319 is about 25300.5991826281. The cubic root of 640120319 is about 861.8278766763.

The spelling of 640120319 in words is "six hundred forty million, one hundred twenty thousand, three hundred nineteen".