18969461928 has 160 divisors (see below), whose sum is σ = 54281858400. Its totient is φ = 6186989952.

The previous prime is 18969461897. The next prime is 18969461971. The reversal of 18969461928 is 82916496981.

18969461928 is a `hidden beast` number, since 1 + 8 + 9 + 6 + 9 + 4 + 619 + 2 + 8 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22082763 + ... + 22083621.

It is an arithmetic number, because the mean of its divisors is an integer number (339261615).

Almost surely, 2^18969461928 is an apocalyptic number.

18969461928 is a gapful number since it is divisible by the number (18) 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 18969461928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27140929200).

18969461928 is an abundant number, since it is smaller than the sum of its proper divisors (35312396472).

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

18969461928 is a wasteful number, since it uses less digits than its factorization.

18969461928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573 (or 1560 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 63.

The spelling of 18969461928 in words is "eighteen billion, nine hundred sixty-nine million, four hundred sixty-one thousand, nine hundred twenty-eight".