28186722 has 12 divisors (see below), whose sum is σ = 61071270. Its totient is φ = 9395568.

The previous prime is 28186703. The next prime is 28186723. The reversal of 28186722 is 22768182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25190361 + 2996361 = 5019^2 + 1731^2 .

It is not an unprimeable number, because it can be changed into a prime (28186723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 782947 + ... + 782982.

Almost surely, 2^28186722 is an apocalyptic number.

28186722 is an abundant number, since it is smaller than the sum of its proper divisors (32884548).

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

28186722 is a wasteful number, since it uses less digits than its factorization.

28186722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565937 (or 1565934 counting only the distinct ones).

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

The square root of 28186722 is about 5309.1168757148. The cubic root of 28186722 is about 304.3323998611.

The spelling of 28186722 in words is "twenty-eight million, one hundred eighty-six thousand, seven hundred twenty-two".