28280690 has 16 divisors (see below), whose sum is σ = 53899992. Its totient is φ = 10646784.

The previous prime is 28280687. The next prime is 28280701. The reversal of 28280690 is 9608282.

It can be written as a sum of positive squares in 4 ways, for example, as 28270489 + 10201 = 5317^2 + 101^2 .

It is a super-2 number, since 2×28280690² = 1599594853752200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28280690.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83009 + ... + 83348.

Almost surely, 2^28280690 is an apocalyptic number.

28280690 is a deficient number, since it is larger than the sum of its proper divisors (25619302).

28280690 is a wasteful number, since it uses less digits than its factorization.

28280690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166381.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 28280690 is about 5317.9591950296. The cubic root of 28280690 is about 304.6702159733.

The spelling of 28280690 in words is "twenty-eight million, two hundred eighty thousand, six hundred ninety".