19312940640 has 384 divisors, whose sum is σ = 73478845440. Its totient is φ = 4165337088.

The previous prime is 19312940611. The next prime is 19312940683. The reversal of 19312940640 is 4604921391.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22535092 + ... + 22535948.

It is an arithmetic number, because the mean of its divisors is an integer number (191351160).

Almost surely, 2^19312940640 is an apocalyptic number.

19312940640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19312940640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36739422720).

19312940640 is an abundant number, since it is smaller than the sum of its proper divisors (54165904800).

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

19312940640 is a wasteful number, since it uses less digits than its factorization.

19312940640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 19312940640 in words is "nineteen billion, three hundred twelve million, nine hundred forty thousand, six hundred forty".