28598309 has 2 divisors, whose sum is σ = 28598310. Its totient is φ = 28598308.

The previous prime is 28598291. The next prime is 28598327. The reversal of 28598309 is 90389582.

It is a balanced prime because it is at equal distance from previous prime (28598291) and next prime (28598327).

It can be written as a sum of positive squares in only one way, i.e., 26553409 + 2044900 = 5153^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 28598309 - 2¹² = 28594213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28598309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28598209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14299154 + 14299155.

It is an arithmetic number, because the mean of its divisors is an integer number (14299155).

Almost surely, 2^28598309 is an apocalyptic number.

It is an amenable number.

28598309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28598309 is an equidigital number, since it uses as much as digits as its factorization.

28598309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 28598309 is about 5347.7386809754. The cubic root of 28598309 is about 305.8065510893.

The spelling of 28598309 in words is "twenty-eight million, five hundred ninety-eight thousand, three hundred nine".