19818273672 has 64 divisors (see below), whose sum is σ = 55585296000. Its totient is φ = 6541947072.

The previous prime is 19818273667. The next prime is 19818273701. The reversal of 19818273672 is 27637281891.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 423147 + ... + 467642.

It is an arithmetic number, because the mean of its divisors is an integer number (868520250).

Almost surely, 2^19818273672 is an apocalyptic number.

19818273672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19818273672 is an abundant number, since it is smaller than the sum of its proper divisors (35767022328).

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

19818273672 is a wasteful number, since it uses less digits than its factorization.

19818273672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890907 (or 890897 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 19818273672 in words is "nineteen billion, eight hundred eighteen million, two hundred seventy-three thousand, six hundred seventy-two".