28435691 has 2 divisors, whose sum is σ = 28435692. Its totient is φ = 28435690.

The previous prime is 28435661. The next prime is 28435697. The reversal of 28435691 is 19653482.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28435691 - 2¹⁰ = 28434667 is a prime.

It is not a weakly prime, because it can be changed into another prime (28435697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14217845 + 14217846.

It is an arithmetic number, because the mean of its divisors is an integer number (14217846).

Almost surely, 2^28435691 is an apocalyptic number.

28435691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28435691 is an equidigital number, since it uses as much as digits as its factorization.

28435691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 28435691 is about 5332.5126347717. The cubic root of 28435691 is about 305.2258150333.

The spelling of 28435691 in words is "twenty-eight million, four hundred thirty-five thousand, six hundred ninety-one".