19428660380 has 24 divisors (see below), whose sum is σ = 42116323200. Its totient is φ = 7520771520.

The previous prime is 19428660371. The next prime is 19428660389. The reversal of 19428660380 is 8306682491.

It is an interprime number because it is at equal distance from previous prime (19428660371) and next prime (19428660389).

It is a super-2 number, since 2×19428660380² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19428660389) 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, 15667655 + ... + 15668894.

It is an arithmetic number, because the mean of its divisors is an integer number (1754846800).

Almost surely, 2^19428660380 is an apocalyptic number.

19428660380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19428660380 is an abundant number, since it is smaller than the sum of its proper divisors (22687662820).

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

19428660380 is a wasteful number, since it uses less digits than its factorization.

19428660380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31336589 (or 31336587 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 19428660380 in words is "nineteen billion, four hundred twenty-eight million, six hundred sixty thousand, three hundred eighty".