28245290 has 32 divisors (see below), whose sum is σ = 52313040. Its totient is φ = 10975744.

The previous prime is 28245289. The next prime is 28245293. The reversal of 28245290 is 9254282.

It can be written as a sum of positive squares in 8 ways, for example, as 12666481 + 15578809 = 3559^2 + 3947^2 .

It is not an unprimeable number, because it can be changed into a prime (28245293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72416 + ... + 72804.

Almost surely, 2^28245290 is an apocalyptic number.

28245290 is a deficient number, since it is larger than the sum of its proper divisors (24067750).

28245290 is a wasteful number, since it uses less digits than its factorization.

28245290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 28245290 is about 5314.6298083686. The cubic root of 28245290 is about 304.5430405177.

The spelling of 28245290 in words is "twenty-eight million, two hundred forty-five thousand, two hundred ninety".