28218372 has 48 divisors (see below), whose sum is σ = 81040512. Its totient is φ = 7441920.

The previous prime is 28218371. The next prime is 28218391. The reversal of 28218372 is 27381282.

It is not an unprimeable number, because it can be changed into a prime (28218371) 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, 11829 + ... + 14012.

It is an arithmetic number, because the mean of its divisors is an integer number (1688344).

Almost surely, 2^28218372 is an apocalyptic number.

It is an amenable number.

28218372 is an abundant number, since it is smaller than the sum of its proper divisors (52822140).

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

28218372 is a wasteful number, since it uses less digits than its factorization.

28218372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25868 (or 25866 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 28218372 is about 5312.0967611669. The cubic root of 28218372 is about 304.4462657386.

The spelling of 28218372 in words is "twenty-eight million, two hundred eighteen thousand, three hundred seventy-two".