28004442 has 16 divisors (see below), whose sum is σ = 58956960. Its totient is φ = 8843472.

The previous prime is 28004437. The next prime is 28004447. The reversal of 28004442 is 24440082.

It is an interprime number because it is at equal distance from previous prime (28004437) and next prime (28004447).

It is not an unprimeable number, because it can be changed into a prime (28004447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122713 + ... + 122940.

It is an arithmetic number, because the mean of its divisors is an integer number (3684810).

Almost surely, 2^28004442 is an apocalyptic number.

28004442 is an abundant number, since it is smaller than the sum of its proper divisors (30952518).

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

28004442 is a wasteful number, since it uses less digits than its factorization.

28004442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245677.

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 28004442 is about 5291.9223350310. The cubic root of 28004442 is about 303.6749541102.

The spelling of 28004442 in words is "twenty-eight million, four thousand, four hundred forty-two".