19208031864 has 128 divisors (see below), whose sum is σ = 55412951040. Its totient is φ = 5434970112.

The previous prime is 19208031847. The next prime is 19208031877. The reversal of 19208031864 is 46813080291.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9309697 + ... + 9311759.

It is an arithmetic number, because the mean of its divisors is an integer number (432913680).

Almost surely, 2^19208031864 is an apocalyptic number.

19208031864 is a gapful number since it is divisible by the number (14) 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 19208031864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27706475520).

19208031864 is an abundant number, since it is smaller than the sum of its proper divisors (36204919176).

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

19208031864 is a wasteful number, since it uses less digits than its factorization.

19208031864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589 (or 2585 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 19208031864 in words is "nineteen billion, two hundred eight million, thirty-one thousand, eight hundred sixty-four".