28392912 has 90 divisors (see below), whose sum is σ = 82741542. Its totient is φ = 9082368.

The previous prime is 28392901. The next prime is 28392919. The reversal of 28392912 is 21929382.

It can be written as a sum of positive squares in 3 ways, for example, as 11451456 + 16941456 = 3384^2 + 4116^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28392919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 388908 + ... + 388980.

Almost surely, 2^28392912 is an apocalyptic number.

It is a pronic number, being equal to 5328×5329.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28392912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41370771).

28392912 is an abundant number, since it is smaller than the sum of its proper divisors (54348630).

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

28392912 is a wasteful number, since it uses less digits than its factorization.

28392912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 115 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 28392912 is about 5328.4999765412. The cubic root of 28392912 is about 305.0726764014.

The spelling of 28392912 in words is "twenty-eight million, three hundred ninety-two thousand, nine hundred twelve".