28981426320 has 1440 divisors, whose sum is σ = 133561451520. Its totient is φ = 5748019200.

The previous prime is 28981426261. The next prime is 28981426339. The reversal of 28981426320 is 2362418982.

28981426320 is a `hidden beast` number, since 2 + 8 + 9 + 8 + 1 + 4 + 2 + 632 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 397005804 + ... + 397005876.

It is an arithmetic number, because the mean of its divisors is an integer number (92751008).

Almost surely, 2^28981426320 is an apocalyptic number.

28981426320 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 28981426320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66780725760).

28981426320 is an abundant number, since it is smaller than the sum of its proper divisors (104580025200).

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

28981426320 is a wasteful number, since it uses less digits than its factorization.

28981426320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 28981426320 in words is "twenty-eight billion, nine hundred eighty-one million, four hundred twenty-six thousand, three hundred twenty".