28668822 has 72 divisors (see below), whose sum is σ = 72349416. Its totient is φ = 7547904.

The previous prime is 28668811. The next prime is 28668823. The reversal of 28668822 is 22886682.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28668823) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 49398 + ... + 49974.

It is an arithmetic number, because the mean of its divisors is an integer number (1004853).

Almost surely, 2^28668822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28668822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36174708).

28668822 is an abundant number, since it is smaller than the sum of its proper divisors (43680594).

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

28668822 is a wasteful number, since it uses less digits than its factorization.

28668822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 602 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 28668822 is about 5354.3274087415. The cubic root of 28668822 is about 306.0576806128.

The spelling of 28668822 in words is "twenty-eight million, six hundred sixty-eight thousand, eight hundred twenty-two".