28900490320 has 80 divisors (see below), whose sum is σ = 72620633232. Its totient is φ = 10632867840.

The previous prime is 28900490293. The next prime is 28900490351. The reversal of 28900490320 is 2309400982.

It can be written as a sum of positive squares in 8 ways, for example, as 2058255424 + 26842234896 = 45368^2 + 163836^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 28900490320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242794 + ... + 341686.

Almost surely, 2^28900490320 is an apocalyptic number.

28900490320 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 28900490320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36310316616).

28900490320 is an abundant number, since it is smaller than the sum of its proper divisors (43720142912).

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

28900490320 is a wasteful number, since it uses less digits than its factorization.

28900490320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99200 (or 99194 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 28900490320 in words is "twenty-eight billion, nine hundred million, four hundred ninety thousand, three hundred twenty".