19839670864 has 40 divisors (see below), whose sum is σ = 41979313152. Its totient is φ = 9027795840.

The previous prime is 19839670859. The next prime is 19839670867. The reversal of 19839670864 is 46807693891.

It is a super-2 number, since 2×19839670864² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19839670867) 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, 656944 + ... + 686479.

Almost surely, 2^19839670864 is an apocalyptic number.

It is an amenable number.

19839670864 is an abundant number, since it is smaller than the sum of its proper divisors (22139642288).

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

19839670864 is a wasteful number, since it uses less digits than its factorization.

19839670864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343515 (or 1343509 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 19839670864 in words is "nineteen billion, eight hundred thirty-nine million, six hundred seventy thousand, eight hundred sixty-four".