19278502440 has 64 divisors (see below), whose sum is σ = 58376064960. Its totient is φ = 5092884480.

The previous prime is 19278502417. The next prime is 19278502493. The reversal of 19278502440 is 4420587291.

It is a junction number, because it is equal to n+sod(n) for n = 19278502392 and 19278502401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 737881 + ... + 763560.

It is an arithmetic number, because the mean of its divisors is an integer number (912126015).

Almost surely, 2^19278502440 is an apocalyptic number.

19278502440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19278502440 is an abundant number, since it is smaller than the sum of its proper divisors (39097562520).

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

19278502440 is a wasteful number, since it uses less digits than its factorization.

19278502440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501562 (or 1501558 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 19278502440 in words is "nineteen billion, two hundred seventy-eight million, five hundred two thousand, four hundred forty".