28286971 has 2 divisors, whose sum is σ = 28286972. Its totient is φ = 28286970.

The previous prime is 28286957. The next prime is 28286983. The reversal of 28286971 is 17968282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28286971 - 2⁵ = 28286939 is a prime.

It is not a weakly prime, because it can be changed into another prime (28286171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14143485 + 14143486.

It is an arithmetic number, because the mean of its divisors is an integer number (14143486).

Almost surely, 2^28286971 is an apocalyptic number.

28286971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28286971 is an equidigital number, since it uses as much as digits as its factorization.

28286971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 28286971 is about 5318.5497083322. The cubic root of 28286971 is about 304.6927695481.

The spelling of 28286971 in words is "twenty-eight million, two hundred eighty-six thousand, nine hundred seventy-one".