28923091 has 2 divisors, whose sum is σ = 28923092. Its totient is φ = 28923090.

The previous prime is 28923079. The next prime is 28923113. The reversal of 28923091 is 19032982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28923091 - 2⁷ = 28922963 is a prime.

It is not a weakly prime, because it can be changed into another prime (28923061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14461545 + 14461546.

It is an arithmetic number, because the mean of its divisors is an integer number (14461546).

Almost surely, 2^28923091 is an apocalyptic number.

28923091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28923091 is an equidigital number, since it uses as much as digits as its factorization.

28923091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 28923091 is about 5378.0192450381. The cubic root of 28923091 is about 306.9598457811.

The spelling of 28923091 in words is "twenty-eight million, nine hundred twenty-three thousand, ninety-one".