28904244 has 48 divisors (see below), whose sum is σ = 71393280. Its totient is φ = 9076320.

The previous prime is 28904243. The next prime is 28904251. The reversal of 28904244 is 44240982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904243) 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, 75277 + ... + 75659.

It is an arithmetic number, because the mean of its divisors is an integer number (1487360).

Almost surely, 2^28904244 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 28904244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35696640).

28904244 is an abundant number, since it is smaller than the sum of its proper divisors (42489036).

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

28904244 is a wasteful number, since it uses less digits than its factorization.

28904244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28904244 is about 5376.2667344543. The cubic root of 28904244 is about 306.8931570897.

The spelling of 28904244 in words is "twenty-eight million, nine hundred four thousand, two hundred forty-four".