28089899 has 4 divisors (see below), whose sum is σ = 29742264. Its totient is φ = 26437536.

The previous prime is 28089883. The next prime is 28089907. The reversal of 28089899 is 99898082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99898082 = 2 ⋅49949041.

It is a cyclic number.

It is not a de Polignac number, because 28089899 - 2⁴ = 28089883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28089899.

It is not an unprimeable number, because it can be changed into a prime (28089869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826157 + ... + 826190.

It is an arithmetic number, because the mean of its divisors is an integer number (7435566).

Almost surely, 2^28089899 is an apocalyptic number.

28089899 is a deficient number, since it is larger than the sum of its proper divisors (1652365).

28089899 is a wasteful number, since it uses less digits than its factorization.

28089899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652364.

The product of its (nonzero) digits is 746496, while the sum is 53.

The square root of 28089899 is about 5299.9904716895. The cubic root of 28089899 is about 303.9835337053.

The spelling of 28089899 in words is "twenty-eight million, eighty-nine thousand, eight hundred ninety-nine".