28323444 has 24 divisors (see below), whose sum is σ = 66287200. Its totient is φ = 9412704.

The previous prime is 28323439. The next prime is 28323467. The reversal of 28323444 is 44432382.

It is a super-2 number, since 2×28323444² = 1604434960042272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 807 + ... + 7569.

Almost surely, 2^28323444 is an apocalyptic number.

It is an amenable number.

28323444 is an abundant number, since it is smaller than the sum of its proper divisors (37963756).

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

28323444 is a wasteful number, since it uses less digits than its factorization.

28323444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7119 (or 7117 counting only the distinct ones).

The product of its digits is 18432, while the sum is 30.

The square root of 28323444 is about 5321.9774520379. The cubic root of 28323444 is about 304.8236694648.

The spelling of 28323444 in words is "twenty-eight million, three hundred twenty-three thousand, four hundred forty-four".