19797365280 has 384 divisors, whose sum is σ = 78173061120. Its totient is φ = 4091351040.

The previous prime is 19797365279. The next prime is 19797365293. The reversal of 19797365280 is 8256379791.

It is a self number, because there is not a number n which added to its sum of digits gives 19797365280.

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, 7279761 + ... + 7282479.

It is an arithmetic number, because the mean of its divisors is an integer number (203575680).

Almost surely, 2^19797365280 is an apocalyptic number.

19797365280 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 19797365280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39086530560).

19797365280 is an abundant number, since it is smaller than the sum of its proper divisors (58375695840).

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

19797365280 is a wasteful number, since it uses less digits than its factorization.

19797365280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952 (or 2944 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 57.

The spelling of 19797365280 in words is "nineteen billion, seven hundred ninety-seven million, three hundred sixty-five thousand, two hundred eighty".