28989397 has 2 divisors, whose sum is σ = 28989398. Its totient is φ = 28989396.

The previous prime is 28989379. The next prime is 28989409. The reversal of 28989397 is 79398982.

Together with previous prime (28989379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15046641 + 13942756 = 3879^2 + 3734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28989397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28989377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14494698 + 14494699.

It is an arithmetic number, because the mean of its divisors is an integer number (14494699).

Almost surely, 2^28989397 is an apocalyptic number.

It is an amenable number.

28989397 is a deficient number, since it is larger than the sum of its proper divisors (1).

28989397 is an equidigital number, since it uses as much as digits as its factorization.

28989397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 55.

The square root of 28989397 is about 5384.1802532976. The cubic root of 28989397 is about 307.1942345844.

The spelling of 28989397 in words is "twenty-eight million, nine hundred eighty-nine thousand, three hundred ninety-seven".