28213472 has 96 divisors (see below), whose sum is σ = 69672960. Its totient is φ = 10967040.

The previous prime is 28213469. The next prime is 28213477. The reversal of 28213472 is 27431282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28213477) 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, 117929 + ... + 118167.

It is an arithmetic number, because the mean of its divisors is an integer number (725760).

Almost surely, 2^28213472 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 28213472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34836480).

28213472 is an abundant number, since it is smaller than the sum of its proper divisors (41459488).

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

28213472 is a wasteful number, since it uses less digits than its factorization.

28213472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 296 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 28213472 is about 5311.6355296650. The cubic root of 28213472 is about 304.4286427864.

The spelling of 28213472 in words is "twenty-eight million, two hundred thirteen thousand, four hundred seventy-two".