28567391 has 2 divisors, whose sum is σ = 28567392. Its totient is φ = 28567390.

The previous prime is 28567381. The next prime is 28567421. The reversal of 28567391 is 19376582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28567391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28567321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14283695 + 14283696.

It is an arithmetic number, because the mean of its divisors is an integer number (14283696).

Almost surely, 2^28567391 is an apocalyptic number.

28567391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28567391 is an equidigital number, since it uses as much as digits as its factorization.

28567391 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 28567391 is about 5344.8471446806. The cubic root of 28567391 is about 305.6963075516.

It can be divided in two parts, 285 and 67391, that added together give a palindrome (67676).

The spelling of 28567391 in words is "twenty-eight million, five hundred sixty-seven thousand, three hundred ninety-one".