19436980640 has 192 divisors, whose sum is σ = 57607925760. Its totient is φ = 6020490240.

The previous prime is 19436980631. The next prime is 19436980723. The reversal of 19436980640 is 4608963491.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2003321 + ... + 2012999.

It is an arithmetic number, because the mean of its divisors is an integer number (300041280).

Almost surely, 2^19436980640 is an apocalyptic number.

19436980640 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 19436980640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28803962880).

19436980640 is an abundant number, since it is smaller than the sum of its proper divisors (38170945120).

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

19436980640 is a wasteful number, since it uses less digits than its factorization.

19436980640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9875 (or 9867 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 19436980640 in words is "nineteen billion, four hundred thirty-six million, nine hundred eighty thousand, six hundred forty".