644014239834 has 16 divisors (see below), whose sum is σ = 1472032548288. Its totient is φ = 184004068512.

The previous prime is 644014239823. The next prime is 644014239851. The reversal of 644014239834 is 438932410446.

It is a super-2 number, since 2×644014239834² (a number of 24 digits) contains 22 as substring.

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, 7666836147 + ... + 7666836230.

It is an arithmetic number, because the mean of its divisors is an integer number (92002034268).

Almost surely, 2^644014239834 is an apocalyptic number.

644014239834 is an abundant number, since it is smaller than the sum of its proper divisors (828018308454).

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

644014239834 is a wasteful number, since it uses less digits than its factorization.

644014239834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15333672389.

The product of its (nonzero) digits is 1990656, while the sum is 48.

The spelling of 644014239834 in words is "six hundred forty-four billion, fourteen million, two hundred thirty-nine thousand, eight hundred thirty-four".