639345927894 has 32 divisors (see below), whose sum is σ = 1281906780000. Its totient is φ = 212580163584.

The previous prime is 639345927887. The next prime is 639345927931. The reversal of 639345927894 is 498729543936.

It is a Curzon number.

It is a congruent 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, 3741432 + ... + 3908580.

It is an arithmetic number, because the mean of its divisors is an integer number (40059586875).

Almost surely, 2^639345927894 is an apocalyptic number.

639345927894 is an abundant number, since it is smaller than the sum of its proper divisors (642560852106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639345927894 is a wasteful number, since it uses less digits than its factorization.

639345927894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168752.

The product of its digits is 352719360, while the sum is 69.

The spelling of 639345927894 in words is "six hundred thirty-nine billion, three hundred forty-five million, nine hundred twenty-seven thousand, eight hundred ninety-four".