28931288464 has 45 divisors (see below), whose sum is σ = 60716490849. Its totient is φ = 13348820160.

The previous prime is 28931288459. The next prime is 28931288479. The reversal of 28931288464 is 46488213982.

The square root of 28931288464 is 170092.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4279776400 + 24651512064 = 65420^2 + 157008^2 .

It is a Duffinian number.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 8843149 + ... + 8846419.

Almost surely, 2^28931288464 is an apocalyptic number.

28931288464 is the 170092-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28931288464

28931288464 is an abundant number, since it is smaller than the sum of its proper divisors (31785202385).

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

28931288464 is an frugal number, since it uses more digits than its factorization.

28931288464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6576 (or 3286 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 55.

The spelling of 28931288464 in words is "twenty-eight billion, nine hundred thirty-one million, two hundred eighty-eight thousand, four hundred sixty-four".