28398922 has 4 divisors (see below), whose sum is σ = 42598386. Its totient is φ = 14199460.

The previous prime is 28398919. The next prime is 28398947. The reversal of 28398922 is 22989382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27678121 + 720801 = 5261^2 + 849^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7099729 + ... + 7099732.

Almost surely, 2^28398922 is an apocalyptic number.

28398922 is a deficient number, since it is larger than the sum of its proper divisors (14199464).

28398922 is a wasteful number, since it uses less digits than its factorization.

28398922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14199463.

The product of its digits is 124416, while the sum is 43.

The square root of 28398922 is about 5329.0638952822. The cubic root of 28398922 is about 305.0942000529.

The spelling of 28398922 in words is "twenty-eight million, three hundred ninety-eight thousand, nine hundred twenty-two".