19397031264 has 144 divisors (see below), whose sum is σ = 59748775632. Its totient is φ = 5933620224.

The previous prime is 19397031223. The next prime is 19397031343. The reversal of 19397031264 is 46213079391.

19397031264 is a `hidden beast` number, since 193 + 97 + 0 + 312 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 632739 + ... + 662685.

It is an arithmetic number, because the mean of its divisors is an integer number (414922053).

Almost surely, 2^19397031264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19397031264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29874387816).

19397031264 is an abundant number, since it is smaller than the sum of its proper divisors (40351744368).

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

19397031264 is a wasteful number, since it uses less digits than its factorization.

19397031264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30149 (or 30138 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The spelling of 19397031264 in words is "nineteen billion, three hundred ninety-seven million, thirty-one thousand, two hundred sixty-four".