28317072 has 80 divisors (see below), whose sum is σ = 84851712. Its totient is φ = 7969920.

The previous prime is 28317017. The next prime is 28317119. The reversal of 28317072 is 27071382.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23263 + ... + 24449.

Almost surely, 2^28317072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28317072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42425856).

28317072 is an abundant number, since it is smaller than the sum of its proper divisors (56534640).

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

28317072 is a wasteful number, since it uses less digits than its factorization.

28317072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276 (or 1270 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 28317072 is about 5321.3787687027. The cubic root of 28317072 is about 304.8008087550.

The spelling of 28317072 in words is "twenty-eight million, three hundred seventeen thousand, seventy-two".