28089992 has 64 divisors (see below), whose sum is σ = 63694080. Its totient is φ = 11354112.

The previous prime is 28089983. The next prime is 28090003. The reversal of 28089992 is 29998082.

It is a happy number.

28089992 is nontrivially palindromic in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145448 + ... + 145640.

It is an arithmetic number, because the mean of its divisors is an integer number (995220).

Almost surely, 2^28089992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28089992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31847040).

28089992 is an abundant number, since it is smaller than the sum of its proper divisors (35604088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28089992 is a wasteful number, since it uses less digits than its factorization.

28089992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 28089992 is about 5299.9992452830. Note that the first 3 decimals coincide. The cubic root of 28089992 is about 303.9838691810.

The spelling of 28089992 in words is "twenty-eight million, eighty-nine thousand, nine hundred ninety-two".