28928380 has 24 divisors (see below), whose sum is σ = 65423232. Its totient is φ = 10681152.

The previous prime is 28928371. The next prime is 28928423. The reversal of 28928380 is 8382982.

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, 55372 + ... + 55891.

It is an arithmetic number, because the mean of its divisors is an integer number (2725968).

Almost surely, 2^28928380 is an apocalyptic number.

28928380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28928380 is an abundant number, since it is smaller than the sum of its proper divisors (36494852).

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

28928380 is a wasteful number, since it uses less digits than its factorization.

28928380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111285 (or 111283 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 28928380 is about 5378.5109463494. The cubic root of 28928380 is about 306.9785553037.

The spelling of 28928380 in words is "twenty-eight million, nine hundred twenty-eight thousand, three hundred eighty".