28851391 has 2 divisors, whose sum is σ = 28851392. Its totient is φ = 28851390.

The previous prime is 28851371. The next prime is 28851437. The reversal of 28851391 is 19315882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28851391 - 2¹¹ = 28849343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28851391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28851301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14425695 + 14425696.

It is an arithmetic number, because the mean of its divisors is an integer number (14425696).

Almost surely, 2^28851391 is an apocalyptic number.

28851391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28851391 is an equidigital number, since it uses as much as digits as its factorization.

28851391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 28851391 is about 5371.3490856581. The cubic root of 28851391 is about 306.7059859530.

The spelling of 28851391 in words is "twenty-eight million, eight hundred fifty-one thousand, three hundred ninety-one".