28280290 has 16 divisors (see below), whose sum is σ = 51171768. Its totient is φ = 11252736.

The previous prime is 28280269. The next prime is 28280297. The reversal of 28280290 is 9208282.

It can be written as a sum of positive squares in 4 ways, for example, as 23338561 + 4941729 = 4831^2 + 2223^2 .

It is not an unprimeable number, because it can be changed into a prime (28280297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5397 + ... + 9256.

Almost surely, 2^28280290 is an apocalyptic number.

28280290 is a deficient number, since it is larger than the sum of its proper divisors (22891478).

28280290 is a wasteful number, since it uses less digits than its factorization.

28280290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14853.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 28280290 is about 5317.9215864847. The cubic root of 28280290 is about 304.6687795555.

The spelling of 28280290 in words is "twenty-eight million, two hundred eighty thousand, two hundred ninety".