18899769280 has 112 divisors (see below), whose sum is σ = 51478525440. Its totient is φ = 6474359808.

The previous prime is 18899769269. The next prime is 18899769289. The reversal of 18899769280 is 8296799881.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18899769289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3265269 + ... + 3271051.

Almost surely, 2^18899769280 is an apocalyptic number.

18899769280 is a gapful number since it is divisible by the number (10) 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 18899769280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25739262720).

18899769280 is an abundant number, since it is smaller than the sum of its proper divisors (32578756160).

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

18899769280 is a wasteful number, since it uses less digits than its factorization.

18899769280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7266 (or 7256 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 67.

The spelling of 18899769280 in words is "eighteen billion, eight hundred ninety-nine million, seven hundred sixty-nine thousand, two hundred eighty".