28104912 has 90 divisors (see below), whose sum is σ = 86508786. Its totient is φ = 8511360.

The previous prime is 28104911. The next prime is 28104997. The reversal of 28104912 is 21940182.

It can be written as a sum of positive squares in only one way, i.e., 25160256 + 2944656 = 5016^2 + 1716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28104911) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16618 + ... + 18230.

Almost surely, 2^28104912 is an apocalyptic number.

28104912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28104912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43254393).

28104912 is an abundant number, since it is smaller than the sum of its proper divisors (58403874).

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

28104912 is a wasteful number, since it uses less digits than its factorization.

28104912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649 (or 1629 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 28104912 is about 5301.4066057981. The cubic root of 28104912 is about 304.0376800017.

The spelling of 28104912 in words is "twenty-eight million, one hundred four thousand, nine hundred twelve".