28273880 has 16 divisors (see below), whose sum is σ = 63616320. Its totient is φ = 11309536.

The previous prime is 28273871. The next prime is 28273901. The reversal of 28273880 is 8837282.

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, 353384 + ... + 353463.

It is an arithmetic number, because the mean of its divisors is an integer number (3976020).

Almost surely, 2^28273880 is an apocalyptic number.

28273880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28273880 is an abundant number, since it is smaller than the sum of its proper divisors (35342440).

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

28273880 is a wasteful number, since it uses less digits than its factorization.

28273880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706858 (or 706854 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28273880 is about 5317.3188732669. The cubic root of 28273880 is about 304.6457591121.

The spelling of 28273880 in words is "twenty-eight million, two hundred seventy-three thousand, eight hundred eighty".