28643959 has 4 divisors (see below), whose sum is σ = 29036416. Its totient is φ = 28251504.

The previous prime is 28643941. The next prime is 28643981. The reversal of 28643959 is 95934682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95934682 = 2 ⋅47967341.

It is a cyclic number.

It is not a de Polignac number, because 28643959 - 2¹⁹ = 28119671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196119 + ... + 196264.

It is an arithmetic number, because the mean of its divisors is an integer number (7259104).

Almost surely, 2^28643959 is an apocalyptic number.

28643959 is a deficient number, since it is larger than the sum of its proper divisors (392457).

28643959 is an equidigital number, since it uses as much as digits as its factorization.

28643959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392456.

The product of its digits is 466560, while the sum is 46.

The square root of 28643959 is about 5352.0051382636. The cubic root of 28643959 is about 305.9691789767.

The spelling of 28643959 in words is "twenty-eight million, six hundred forty-three thousand, nine hundred fifty-nine".