28646239 has 2 divisors, whose sum is σ = 28646240. Its totient is φ = 28646238.

The previous prime is 28646221. The next prime is 28646333. The reversal of 28646239 is 93264682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28646239 - 2¹⁵ = 28613471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28646209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14323119 + 14323120.

It is an arithmetic number, because the mean of its divisors is an integer number (14323120).

Almost surely, 2^28646239 is an apocalyptic number.

28646239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28646239 is an equidigital number, since it uses as much as digits as its factorization.

28646239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 40.

The square root of 28646239 is about 5352.2181383049. The cubic root of 28646239 is about 305.9772969330.

The spelling of 28646239 in words is "twenty-eight million, six hundred forty-six thousand, two hundred thirty-nine".