28918272 has 80 divisors (see below), whose sum is σ = 78468192. Its totient is φ = 9461760.

The previous prime is 28918271. The next prime is 28918273. The reversal of 28918272 is 27281982.

It is an interprime number because it is at equal distance from previous prime (28918271) and next prime (28918273).

It is a self number, because there is not a number n which added to its sum of digits gives 28918272.

It is not an unprimeable number, because it can be changed into a prime (28918271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102772 + ... + 103052.

Almost surely, 2^28918272 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 28918272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39234096).

28918272 is an abundant number, since it is smaller than the sum of its proper divisors (49549920).

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

28918272 is an equidigital number, since it uses as much as digits as its factorization.

28918272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 353 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 28918272 is about 5377.5711989708. The cubic root of 28918272 is about 306.9427968696.

The spelling of 28918272 in words is "twenty-eight million, nine hundred eighteen thousand, two hundred seventy-two".