28089969 has 16 divisors (see below), whose sum is σ = 39345792. Its totient is φ = 17791488.

The previous prime is 28089949. The next prime is 28089979. The reversal of 28089969 is 96998082.

It is not a de Polignac number, because 28089969 - 2⁸ = 28089713 is a prime.

It is a super-2 number, since 2×28089969² = 1578092716841922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28089949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9537 + ... + 12129.

It is an arithmetic number, because the mean of its divisors is an integer number (2459112).

Almost surely, 2^28089969 is an apocalyptic number.

It is an amenable number.

28089969 is a deficient number, since it is larger than the sum of its proper divisors (11255823).

28089969 is a wasteful number, since it uses less digits than its factorization.

28089969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 28089969 is about 5299.9970754709. The cubic root of 28089969 is about 303.9837862140.

The spelling of 28089969 in words is "twenty-eight million, eighty-nine thousand, nine hundred sixty-nine".