28665898 has 16 divisors (see below), whose sum is σ = 45000360. Its totient is φ = 13680576.

The previous prime is 28665887. The next prime is 28665943. The reversal of 28665898 is 89856682.

It can be written as a sum of positive squares in 4 ways, for example, as 28483569 + 182329 = 5337^2 + 427^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268 + ... + 7576.

Almost surely, 2^28665898 is an apocalyptic number.

28665898 is a deficient number, since it is larger than the sum of its proper divisors (16334462).

28665898 is a wasteful number, since it uses less digits than its factorization.

28665898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7401.

The product of its digits is 1658880, while the sum is 52.

The square root of 28665898 is about 5354.0543516106. The cubic root of 28665898 is about 306.0472750802.

The spelling of 28665898 in words is "twenty-eight million, six hundred sixty-five thousand, eight hundred ninety-eight".