28317772 has 12 divisors (see below), whose sum is σ = 56635600. Its totient is φ = 12136176.

The previous prime is 28317769. The next prime is 28317781. The reversal of 28317772 is 27771382.

28317772 is an admirable number.

It is a super-2 number, since 2×28317772² = 1603792422087968, which contains 22 as substring.

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, 505647 + ... + 505702.

Almost surely, 2^28317772 is an apocalyptic number.

It is an amenable number.

28317772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28317772 is a wasteful number, since it uses less digits than its factorization.

28317772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011360 (or 1011358 counting only the distinct ones).

The product of its digits is 32928, while the sum is 37.

The square root of 28317772 is about 5321.4445407239. Note that the first 3 decimals coincide. The cubic root of 28317772 is about 304.8033203001.

The spelling of 28317772 in words is "twenty-eight million, three hundred seventeen thousand, seven hundred seventy-two".