28432091 has 2 divisors, whose sum is σ = 28432092. Its totient is φ = 28432090.

The previous prime is 28432087. The next prime is 28432097. The reversal of 28432091 is 19023482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28432091 - 2² = 28432087 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28432097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14216045 + 14216046.

It is an arithmetic number, because the mean of its divisors is an integer number (14216046).

Almost surely, 2^28432091 is an apocalyptic number.

28432091 is a deficient number, since it is larger than the sum of its proper divisors (1).

28432091 is an equidigital number, since it uses as much as digits as its factorization.

28432091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 28432091 is about 5332.1750721446. The cubic root of 28432091 is about 305.2129338117.

The spelling of 28432091 in words is "twenty-eight million, four hundred thirty-two thousand, ninety-one".