28863971 has 2 divisors, whose sum is σ = 28863972. Its totient is φ = 28863970.

The previous prime is 28863953. The next prime is 28864001. The reversal of 28863971 is 17936882.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28863971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28863941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14431985 + 14431986.

It is an arithmetic number, because the mean of its divisors is an integer number (14431986).

Almost surely, 2^28863971 is an apocalyptic number.

28863971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28863971 is an equidigital number, since it uses as much as digits as its factorization.

28863971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 28863971 is about 5372.5199860028. The cubic root of 28863971 is about 306.7505568907.

The spelling of 28863971 in words is "twenty-eight million, eight hundred sixty-three thousand, nine hundred seventy-one".