19878281280 has 1120 divisors, whose sum is σ = 86247963648. Its totient is φ = 4279910400.

The previous prime is 19878281201. The next prime is 19878281281. The reversal of 19878281280 is 8218287891.

19878281280 is a `hidden beast` number, since 1 + 9 + 87 + 8 + 281 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19878281281) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 114903274 + ... + 114903446.

Almost surely, 2^19878281280 is an apocalyptic number.

19878281280 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 19878281280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43123981824).

19878281280 is an abundant number, since it is smaller than the sum of its proper divisors (66369682368).

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

19878281280 is a wasteful number, since it uses less digits than its factorization.

19878281280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 54.

The spelling of 19878281280 in words is "nineteen billion, eight hundred seventy-eight million, two hundred eighty-one thousand, two hundred eighty".