639311345 has 16 divisors (see below), whose sum is σ = 788755968. Its totient is φ = 497090880.

The previous prime is 639311339. The next prime is 639311353. The reversal of 639311345 is 543113936.

It is not a de Polignac number, because 639311345 - 2⁴ = 639311329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340760 + ... + 342630.

It is an arithmetic number, because the mean of its divisors is an integer number (49297248).

Almost surely, 2^639311345 is an apocalyptic number.

It is an amenable number.

639311345 is a deficient number, since it is larger than the sum of its proper divisors (149444623).

639311345 is a wasteful number, since it uses less digits than its factorization.

639311345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760.

The product of its digits is 29160, while the sum is 35.

The square root of 639311345 is about 25284.6068784943. The cubic root of 639311345 is about 861.4646687853.

The spelling of 639311345 in words is "six hundred thirty-nine million, three hundred eleven thousand, three hundred forty-five".