28532090 has 24 divisors (see below), whose sum is σ = 53085780.
Its totient is φ = 11040960.
The previous prime is 28532089. The next prime is 28532099. The reversal of 28532090 is 9023582.
It can be written as a sum of positive squares in 2 ways, for example, as 23687689 + 4844401 = 4867^2 + 2201^2
It is not an unprimeable number, because it can be changed into a prime (28532099) 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, 8126 + ... + 11094.
Almost surely, 228532090 is an apocalyptic number.
28532090 is a deficient number, since it is larger than the sum of its proper divisors (24553690).
28532090 is a wasteful number, since it uses less digits than its factorization.
28532090 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3038 (or 3007 counting only the distinct ones).
The product of its (nonzero) digits is 4320, while the sum is 29.
The square root of 28532090 is about 5341.5437843380.
The cubic root of 28532090 is about 305.5703383604.
The spelling of 28532090 in words is "twenty-eight million, five hundred thirty-two thousand, ninety".