28856290 has 16 divisors (see below), whose sum is σ = 52172280. Its totient is φ = 11491200.

The previous prime is 28856279. The next prime is 28856291. The reversal of 28856290 is 9265882.

It can be written as a sum of positive squares in 4 ways, for example, as 26615281 + 2241009 = 5159^2 + 1497^2 .

It is not an unprimeable number, because it can be changed into a prime (28856291) 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, 4011 + ... + 8590.

Almost surely, 2^28856290 is an apocalyptic number.

28856290 is a deficient number, since it is larger than the sum of its proper divisors (23315990).

28856290 is a wasteful number, since it uses less digits than its factorization.

28856290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12837.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 28856290 is about 5371.8050969856. The cubic root of 28856290 is about 306.7233446491.

The spelling of 28856290 in words is "twenty-eight million, eight hundred fifty-six thousand, two hundred ninety".