28726218 has 64 divisors (see below), whose sum is σ = 67564800. Its totient is φ = 9028800.

The previous prime is 28726189. The next prime is 28726219. The reversal of 28726218 is 81262782.

It is a happy number.

28726218 is a `hidden beast` number, since 28 + 7 + 2 + 621 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (28726219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125328 + ... + 125556.

It is an arithmetic number, because the mean of its divisors is an integer number (1055700).

Almost surely, 2^28726218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28726218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33782400).

28726218 is an abundant number, since it is smaller than the sum of its proper divisors (38838582).

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

28726218 is a wasteful number, since it uses less digits than its factorization.

28726218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 358 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28726218 is about 5359.6845056402. The cubic root of 28726218 is about 306.2617905776.

The spelling of 28726218 in words is "twenty-eight million, seven hundred twenty-six thousand, two hundred eighteen".