28642091 has 2 divisors, whose sum is σ = 28642092. Its totient is φ = 28642090.

The previous prime is 28642079. The next prime is 28642099. The reversal of 28642091 is 19024682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28642091 - 2¹⁸ = 28379947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28642099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14321045 + 14321046.

It is an arithmetic number, because the mean of its divisors is an integer number (14321046).

Almost surely, 2^28642091 is an apocalyptic number.

28642091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28642091 is an equidigital number, since it uses as much as digits as its factorization.

28642091 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28642091 is about 5351.8306213855. The cubic root of 28642091 is about 305.9625276283.

The spelling of 28642091 in words is "twenty-eight million, six hundred forty-two thousand, ninety-one".