19490815872 has 96 divisors (see below), whose sum is σ = 61185697560. Its totient is φ = 5906304000.

The previous prime is 19490815867. The next prime is 19490815889. The reversal of 19490815872 is 27851809491.

It is a happy number.

19490815872 is a `hidden beast` number, since 1 + 9 + 490 + 81 + 5 + 8 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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 11 ways as a sum of consecutive naturals, for example, 756379 + ... + 781722.

Almost surely, 2^19490815872 is an apocalyptic number.

19490815872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19490815872 is an abundant number, since it is smaller than the sum of its proper divisors (41694881688).

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

19490815872 is a wasteful number, since it uses less digits than its factorization.

19490815872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538132 (or 1538117 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 19490815872 in words is "nineteen billion, four hundred ninety million, eight hundred fifteen thousand, eight hundred seventy-two".