28424272 has 40 divisors (see below), whose sum is σ = 60210432. Its totient is φ = 12940800.

The previous prime is 28424243. The next prime is 28424287. The reversal of 28424272 is 27242482.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6747 + ... + 10117.

Almost surely, 2^28424272 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 28424272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30105216).

28424272 is an abundant number, since it is smaller than the sum of its proper divisors (31786160).

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

28424272 is a wasteful number, since it uses less digits than its factorization.

28424272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427 (or 3421 counting only the distinct ones).

The product of its digits is 14336, while the sum is 31.

The square root of 28424272 is about 5331.4418312498. The cubic root of 28424272 is about 305.1849527682.

The spelling of 28424272 in words is "twenty-eight million, four hundred twenty-four thousand, two hundred seventy-two".