19890928780 has 24 divisors (see below), whose sum is σ = 41774342400. Its totient is φ = 7955725440.

The previous prime is 19890928721. The next prime is 19890928787. The reversal of 19890928780 is 8782909891.

It is a super-3 number, since 3×19890928780³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (19890928787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270421 + ... + 336019.

It is an arithmetic number, because the mean of its divisors is an integer number (1740597600).

Almost surely, 2^19890928780 is an apocalyptic number.

19890928780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19890928780 is an abundant number, since it is smaller than the sum of its proper divisors (21883413620).

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

19890928780 is a wasteful number, since it uses less digits than its factorization.

19890928780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80769 (or 80767 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 61.

The spelling of 19890928780 in words is "nineteen billion, eight hundred ninety million, nine hundred twenty-eight thousand, seven hundred eighty".