28394244 has 36 divisors (see below), whose sum is σ = 73717644. Its totient is φ = 9208512.

The previous prime is 28394203. The next prime is 28394257. The reversal of 28394244 is 44249382.

28394244 is a `hidden beast` number, since 28 + 394 + 244 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27562500 + 831744 = 5250^2 + 912^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 28394199 and 28394208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9327 + ... + 11990.

Almost surely, 2^28394244 is an apocalyptic number.

It is an amenable number.

28394244 is an abundant number, since it is smaller than the sum of its proper divisors (45323400).

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

28394244 is a wasteful number, since it uses less digits than its factorization.

28394244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21364 (or 21359 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 28394244 is about 5328.6249633465. The cubic root of 28394244 is about 305.0774469635.

The spelling of 28394244 in words is "twenty-eight million, three hundred ninety-four thousand, two hundred forty-four".