28375691 has 2 divisors, whose sum is σ = 28375692. Its totient is φ = 28375690.

The previous prime is 28375687. The next prime is 28375693. The reversal of 28375691 is 19657382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28375691 - 2² = 28375687 is a prime.

Together with 28375693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28375693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14187845 + 14187846.

It is an arithmetic number, because the mean of its divisors is an integer number (14187846).

Almost surely, 2^28375691 is an apocalyptic number.

28375691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28375691 is an equidigital number, since it uses as much as digits as its factorization.

28375691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 28375691 is about 5326.8837982445. The cubic root of 28375691 is about 305.0109858983.

The spelling of 28375691 in words is "twenty-eight million, three hundred seventy-five thousand, six hundred ninety-one".