28357387 has 2 divisors, whose sum is σ = 28357388. Its totient is φ = 28357386.

The previous prime is 28357379. The next prime is 28357391. The reversal of 28357387 is 78375382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28357387 - 2³ = 28357379 is a prime.

It is not a weakly prime, because it can be changed into another prime (28357327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14178693 + 14178694.

It is an arithmetic number, because the mean of its divisors is an integer number (14178694).

Almost surely, 2^28357387 is an apocalyptic number.

28357387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28357387 is an equidigital number, since it uses as much as digits as its factorization.

28357387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 43.

The square root of 28357387 is about 5325.1654434393. The cubic root of 28357387 is about 304.9453884126.

The spelling of 28357387 in words is "twenty-eight million, three hundred fifty-seven thousand, three hundred eighty-seven".