19878767480 has 256 divisors, whose sum is σ = 55890777600. Its totient is φ = 6255360000.

The previous prime is 19878767449. The next prime is 19878767483. The reversal of 19878767480 is 8476787891.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19878767483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10975775 + ... + 10977585.

It is an arithmetic number, because the mean of its divisors is an integer number (218323350).

Almost surely, 2^19878767480 is an apocalyptic number.

19878767480 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 19878767480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27945388800).

19878767480 is an abundant number, since it is smaller than the sum of its proper divisors (36012010120).

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

19878767480 is a wasteful number, since it uses less digits than its factorization.

19878767480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966 (or 1962 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 65.

The spelling of 19878767480 in words is "nineteen billion, eight hundred seventy-eight million, seven hundred sixty-seven thousand, four hundred eighty".