28406291 has 2 divisors, whose sum is σ = 28406292. Its totient is φ = 28406290.

The previous prime is 28406249. The next prime is 28406309. The reversal of 28406291 is 19260482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28406291 - 2¹⁸ = 28144147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28406591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14203145 + 14203146.

It is an arithmetic number, because the mean of its divisors is an integer number (14203146).

Almost surely, 2^28406291 is an apocalyptic number.

28406291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28406291 is an equidigital number, since it uses as much as digits as its factorization.

28406291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28406291 is about 5329.7552476638. The cubic root of 28406291 is about 305.1205865560.

The spelling of 28406291 in words is "twenty-eight million, four hundred six thousand, two hundred ninety-one".