28940442 has 8 divisors (see below), whose sum is σ = 57880896. Its totient is φ = 9646812.

The previous prime is 28940441. The next prime is 28940459. The reversal of 28940442 is 24404982.

It is a sphenic number, since it is the product of 3 distinct primes.

28940442 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28940441) 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 3 ways as a sum of consecutive naturals, for example, 2411698 + ... + 2411709.

It is an arithmetic number, because the mean of its divisors is an integer number (7235112).

Almost surely, 2^28940442 is an apocalyptic number.

28940442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28940442 is a wasteful number, since it uses less digits than its factorization.

28940442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4823412.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 28940442 is about 5379.6321435578. The cubic root of 28940442 is about 307.0212153814.

The spelling of 28940442 in words is "twenty-eight million, nine hundred forty thousand, four hundred forty-two".