28228662 has 160 divisors (see below), whose sum is σ = 82520064. Its totient is φ = 6998400.

The previous prime is 28228639. The next prime is 28228663. The reversal of 28228662 is 26682282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28228663) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 386658 + ... + 386730.

Almost surely, 2^28228662 is an apocalyptic number.

28228662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28228662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41260032).

28228662 is an abundant number, since it is smaller than the sum of its proper divisors (54291402).

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

28228662 is a wasteful number, since it uses less digits than its factorization.

28228662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 127 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 28228662 is about 5313.0652169910. The cubic root of 28228662 is about 304.4832672986.

The spelling of 28228662 in words is "twenty-eight million, two hundred twenty-eight thousand, six hundred sixty-two".