28304442 has 24 divisors (see below), whose sum is σ = 61937460. Its totient is φ = 9340800.

The previous prime is 28304429. The next prime is 28304447. The reversal of 28304442 is 24440382.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26842761 + 1461681 = 5181^2 + 1209^2 .

It is a super-2 number, since 2×28304442² = 1602282873862728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28304447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5967 + ... + 9602.

Almost surely, 2^28304442 is an apocalyptic number.

28304442 is an abundant number, since it is smaller than the sum of its proper divisors (33633018).

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

28304442 is a wasteful number, since it uses less digits than its factorization.

28304442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15678 (or 15675 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 28304442 is about 5320.1919138317. The cubic root of 28304442 is about 304.7554861937.

The spelling of 28304442 in words is "twenty-eight million, three hundred four thousand, four hundred forty-two".