19890110464 has 136 divisors (see below), whose sum is σ = 45902112768. Its totient is φ = 8442347520.

The previous prime is 19890110417. The next prime is 19890110467. The reversal of 19890110464 is 46401109891.

It is a self number, because there is not a number n which added to its sum of digits gives 19890110464.

It is not an unprimeable number, because it can be changed into a prime (19890110467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87621519 + ... + 87621745.

Almost surely, 2^19890110464 is an apocalyptic number.

19890110464 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 19890110464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22951056384).

19890110464 is an abundant number, since it is smaller than the sum of its proper divisors (26012002304).

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

19890110464 is an frugal number, since it uses more digits than its factorization.

19890110464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 19890110464 in words is "nineteen billion, eight hundred ninety million, one hundred ten thousand, four hundred sixty-four".