28243494 has 48 divisors (see below), whose sum is σ = 67627872. Its totient is φ = 8473344.

The previous prime is 28243487. The next prime is 28243507. The reversal of 28243494 is 49434282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5032 + ... + 9044.

It is an arithmetic number, because the mean of its divisors is an integer number (1408914).

Almost surely, 2^28243494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28243494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33813936).

28243494 is an abundant number, since it is smaller than the sum of its proper divisors (39384378).

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

28243494 is a wasteful number, since it uses less digits than its factorization.

28243494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061 (or 4058 counting only the distinct ones).

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

The square root of 28243494 is about 5314.4608381284. The cubic root of 28243494 is about 304.5365855076.

The spelling of 28243494 in words is "twenty-eight million, two hundred forty-three thousand, four hundred ninety-four".