28447722 has 12 divisors (see below), whose sum is σ = 61636770. Its totient is φ = 9482568.

The previous prime is 28447721. The next prime is 28447723. The reversal of 28447722 is 22774482.

It is an interprime number because it is at equal distance from previous prime (28447721) and next prime (28447723).

It can be written as a sum of positive squares in only one way, i.e., 26224641 + 2223081 = 5121^2 + 1491^2 .

It is a super-3 number, since 3×28447722³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28447721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 790197 + ... + 790232.

Almost surely, 2^28447722 is an apocalyptic number.

28447722 is an abundant number, since it is smaller than the sum of its proper divisors (33189048).

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

28447722 is a wasteful number, since it uses less digits than its factorization.

28447722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580437 (or 1580434 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

The square root of 28447722 is about 5333.6405953157. The cubic root of 28447722 is about 305.2688554739.

The spelling of 28447722 in words is "twenty-eight million, four hundred forty-seven thousand, seven hundred twenty-two".