28391338080 has 384 divisors, whose sum is σ = 115497446400. Its totient is φ = 6379057152.

The previous prime is 28391338067. The next prime is 28391338093. The reversal of 28391338080 is 8083319382.

It is an interprime number because it is at equal distance from previous prime (28391338067) and next prime (28391338093).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1776204 + ... + 1792116.

It is an arithmetic number, because the mean of its divisors is an integer number (300774600).

Almost surely, 2^28391338080 is an apocalyptic number.

28391338080 is a gapful number since it is divisible by the number (20) 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 28391338080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57748723200).

28391338080 is an abundant number, since it is smaller than the sum of its proper divisors (87106108320).

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

28391338080 is a wasteful number, since it uses less digits than its factorization.

28391338080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16003 (or 15989 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 28391338080 in words is "twenty-eight billion, three hundred ninety-one million, three hundred thirty-eight thousand, eighty".