28442971 has 4 divisors (see below), whose sum is σ = 29136744. Its totient is φ = 27749200.

The previous prime is 28442969. The next prime is 28442987. The reversal of 28442971 is 17924482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28442971 - 2¹ = 28442969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28442971.

It is not an unprimeable number, because it can be changed into a prime (28442941) 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 3 ways as a sum of consecutive naturals, for example, 346825 + ... + 346906.

It is an arithmetic number, because the mean of its divisors is an integer number (7284186).

Almost surely, 2^28442971 is an apocalyptic number.

28442971 is a deficient number, since it is larger than the sum of its proper divisors (693773).

28442971 is an equidigital number, since it uses as much as digits as its factorization.

28442971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693772.

The product of its digits is 32256, while the sum is 37.

The square root of 28442971 is about 5333.1951961277. The cubic root of 28442971 is about 305.2518604039.

The spelling of 28442971 in words is "twenty-eight million, four hundred forty-two thousand, nine hundred seventy-one".