19978955280 has 120 divisors (see below), whose sum is σ = 67290193152. Its totient is φ = 5312301312.

The previous prime is 19978955261. The next prime is 19978955323. The reversal of 19978955280 is 8255987991.

19978955280 is a `hidden beast` number, since 1 + 9 + 9 + 78 + 9 + 552 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209857 + ... + 289823.

Almost surely, 2^19978955280 is an apocalyptic number.

19978955280 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 19978955280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33645096576).

19978955280 is an abundant number, since it is smaller than the sum of its proper divisors (47311237872).

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

19978955280 is a wasteful number, since it uses less digits than its factorization.

19978955280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80333 (or 80324 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 63.

The spelling of 19978955280 in words is "nineteen billion, nine hundred seventy-eight million, nine hundred fifty-five thousand, two hundred eighty".