28308580 has 24 divisors (see below), whose sum is σ = 61367040. Its totient is φ = 10957920.

The previous prime is 28308571. The next prime is 28308593. The reversal of 28308580 is 8580382.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22210 + ... + 23449.

It is an arithmetic number, because the mean of its divisors is an integer number (2556960).

Almost surely, 2^28308580 is an apocalyptic number.

28308580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28308580 is an abundant number, since it is smaller than the sum of its proper divisors (33058460).

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

28308580 is a wasteful number, since it uses less digits than its factorization.

28308580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45699 (or 45697 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 28308580 is about 5320.5807953644. The cubic root of 28308580 is about 304.7703368280.

The spelling of 28308580 in words is "twenty-eight million, three hundred eight thousand, five hundred eighty".