28646971 has 2 divisors, whose sum is σ = 28646972. Its totient is φ = 28646970.

The previous prime is 28646957. The next prime is 28646993. The reversal of 28646971 is 17964682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28646971 - 2¹⁵ = 28614203 is a prime.

It is not a weakly prime, because it can be changed into another prime (28646911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14323485 + 14323486.

It is an arithmetic number, because the mean of its divisors is an integer number (14323486).

Almost surely, 2^28646971 is an apocalyptic number.

28646971 is a deficient number, since it is larger than the sum of its proper divisors (1).

28646971 is an equidigital number, since it uses as much as digits as its factorization.

28646971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 28646971 is about 5352.2865207311. The cubic root of 28646971 is about 305.9799031328.

The spelling of 28646971 in words is "twenty-eight million, six hundred forty-six thousand, nine hundred seventy-one".