19278000000 has 1120 divisors, whose sum is σ = 86778576720. Its totient is φ = 4147200000.

The previous prime is 19277999921. The next prime is 19278000023. The reversal of 19278000000 is 87291.

It is a tau number, because it is divible by the number of its divisors (1120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 139 ways as a sum of consecutive naturals, for example, 1133999992 + ... + 1134000008.

Almost surely, 2^19278000000 is an apocalyptic number.

19278000000 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 19278000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43389288360).

19278000000 is an abundant number, since it is smaller than the sum of its proper divisors (67500576720).

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

19278000000 is an frugal number, since it uses more digits than its factorization.

19278000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

Adding to 19278000000 its reverse (87291), we get a palindrome (19278087291).

The spelling of 19278000000 in words is "nineteen billion, two hundred seventy-eight million", and thus it is an aban number.