28317690 has 24 divisors (see below), whose sum is σ = 73626228. Its totient is φ = 7551360.

The previous prime is 28317683. The next prime is 28317697. The reversal of 28317690 is 9671382.

It is an interprime number because it is at equal distance from previous prime (28317683) and next prime (28317697).

It can be written as a sum of positive squares in 2 ways, for example, as 26040609 + 2277081 = 5103^2 + 1509^2 .

It is a super-2 number, since 2×28317690² = 1603783133872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28317697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157231 + ... + 157410.

Almost surely, 2^28317690 is an apocalyptic number.

28317690 is an abundant number, since it is smaller than the sum of its proper divisors (45308538).

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

28317690 is a wasteful number, since it uses less digits than its factorization.

28317690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314654 (or 314651 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28317690 is about 5321.4368360434. The cubic root of 28317690 is about 304.8030260927.

The spelling of 28317690 in words is "twenty-eight million, three hundred seventeen thousand, six hundred ninety".