28893691 has 2 divisors, whose sum is σ = 28893692. Its totient is φ = 28893690.

The previous prime is 28893679. The next prime is 28893701. The reversal of 28893691 is 19639882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28893691 - 2¹⁹ = 28369403 is a prime.

It is not a weakly prime, because it can be changed into another prime (28893671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14446845 + 14446846.

It is an arithmetic number, because the mean of its divisors is an integer number (14446846).

Almost surely, 2^28893691 is an apocalyptic number.

28893691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28893691 is an equidigital number, since it uses as much as digits as its factorization.

28893691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 28893691 is about 5375.2852017358. The cubic root of 28893691 is about 306.8558034319.

It can be divided in two parts, 28893 and 691, that added together give a square (29584 = 172²).

The spelling of 28893691 in words is "twenty-eight million, eight hundred ninety-three thousand, six hundred ninety-one".