19909000764 has 108 divisors (see below), whose sum is σ = 53555229000. Its totient is φ = 6234840576.

The previous prime is 19909000763. The next prime is 19909000829. The reversal of 19909000764 is 46700090991.

It is a super-2 number, since 2×19909000764² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19909000763) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7375087 + ... + 7377785.

It is an arithmetic number, because the mean of its divisors is an integer number (495881750).

Almost surely, 2^19909000764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19909000764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26777614500).

19909000764 is an abundant number, since it is smaller than the sum of its proper divisors (33646228236).

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

19909000764 is a wasteful number, since it uses less digits than its factorization.

19909000764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3452 (or 3430 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 19909000764 in words is "nineteen billion, nine hundred nine million, seven hundred sixty-four", and thus it is an aban number.