28233898 has 36 divisors (see below), whose sum is σ = 54173826. Its totient is φ = 10995600.

The previous prime is 28233883. The next prime is 28233899. The reversal of 28233898 is 89833282.

It can be written as a sum of positive squares in only one way, i.e., 28227969 + 5929 = 5313^2 + 77^2 .

It is not an unprimeable number, because it can be changed into a prime (28233899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10668 + ... + 13048.

Almost surely, 2^28233898 is an apocalyptic number.

28233898 is a deficient number, since it is larger than the sum of its proper divisors (25939928).

28233898 is a wasteful number, since it uses less digits than its factorization.

28233898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419 (or 2401 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 28233898 is about 5313.5579417185. The cubic root of 28233898 is about 304.5020918516.

Subtracting from 28233898 its sum of digits (43), we obtain a triangular number (28233855 = T₇₅₁₄).

The spelling of 28233898 in words is "twenty-eight million, two hundred thirty-three thousand, eight hundred ninety-eight".