28971983 has 2 divisors, whose sum is σ = 28971984. Its totient is φ = 28971982.

The previous prime is 28971947. The next prime is 28971991. The reversal of 28971983 is 38917982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28971983 - 2¹⁴ = 28955599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28971923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14485991 + 14485992.

It is an arithmetic number, because the mean of its divisors is an integer number (14485992).

Almost surely, 2^28971983 is an apocalyptic number.

28971983 is a deficient number, since it is larger than the sum of its proper divisors (1).

28971983 is an equidigital number, since it uses as much as digits as its factorization.

28971983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 28971983 is about 5382.5628654016. The cubic root of 28971983 is about 307.1327114937.

The spelling of 28971983 in words is "twenty-eight million, nine hundred seventy-one thousand, nine hundred eighty-three".