28928980 has 12 divisors (see below), whose sum is σ = 60750900. Its totient is φ = 11571584.

The previous prime is 28928957. The next prime is 28929023. The reversal of 28928980 is 8982982.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14776336 + 14152644 = 3844^2 + 3762^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28928980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 723205 + ... + 723244.

It is an arithmetic number, because the mean of its divisors is an integer number (5062575).

Almost surely, 2^28928980 is an apocalyptic number.

28928980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28928980 is an abundant number, since it is smaller than the sum of its proper divisors (31821920).

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

28928980 is a wasteful number, since it uses less digits than its factorization.

28928980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446458 (or 1446456 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 28928980 is about 5378.5667235798. The cubic root of 28928980 is about 306.9806776240.

The spelling of 28928980 in words is "twenty-eight million, nine hundred twenty-eight thousand, nine hundred eighty".