28120898 has 24 divisors (see below), whose sum is σ = 46272828. Its totient is φ = 12740832.

The previous prime is 28120891. The next prime is 28120903. The reversal of 28120898 is 89802182.

It can be written as a sum of positive squares in 2 ways, for example, as 25633969 + 2486929 = 5063^2 + 1577^2 .

It is not an unprimeable number, because it can be changed into a prime (28120891) 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, 179036 + ... + 179192.

Almost surely, 2^28120898 is an apocalyptic number.

28120898 is a deficient number, since it is larger than the sum of its proper divisors (18151930).

28120898 is a wasteful number, since it uses less digits than its factorization.

28120898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 28120898 is about 5302.9141045278. The cubic root of 28120898 is about 304.0953143531.

The spelling of 28120898 in words is "twenty-eight million, one hundred twenty thousand, eight hundred ninety-eight".