19278797460 has 384 divisors, whose sum is σ = 62240016384. Its totient is φ = 4425891840.

The previous prime is 19278797459. The next prime is 19278797471. The reversal of 19278797460 is 6479787291.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 19278797394 and 19278797403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 82741504 + ... + 82741736.

It is an arithmetic number, because the mean of its divisors is an integer number (162083376).

Almost surely, 2^19278797460 is an apocalyptic number.

19278797460 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 19278797460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31120008192).

19278797460 is an abundant number, since it is smaller than the sum of its proper divisors (42961218924).

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

19278797460 is a wasteful number, since it uses less digits than its factorization.

19278797460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 60.

The spelling of 19278797460 in words is "nineteen billion, two hundred seventy-eight million, seven hundred ninety-seven thousand, four hundred sixty".