28317872 has 30 divisors (see below), whose sum is σ = 60311244. Its totient is φ = 12870880.

The previous prime is 28317823. The next prime is 28317881. The reversal of 28317872 is 27871382.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5378 + ... + 9249.

Almost surely, 2^28317872 is an apocalyptic number.

28317872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28317872 is an abundant number, since it is smaller than the sum of its proper divisors (31993372).

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

28317872 is a wasteful number, since it uses less digits than its factorization.

28317872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14657 (or 14640 counting only the distinct ones).

The product of its digits is 37632, while the sum is 38.

The square root of 28317872 is about 5321.4539366605. The cubic root of 28317872 is about 304.8036790889.

The spelling of 28317872 in words is "twenty-eight million, three hundred seventeen thousand, eight hundred seventy-two".