28999609 has 2 divisors, whose sum is σ = 28999610. Its totient is φ = 28999608.

The previous prime is 28999577. The next prime is 28999613. The reversal of 28999609 is 90699982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17405584 + 11594025 = 4172^2 + 3405^2 .

It is a cyclic number.

It is not a de Polignac number, because 28999609 - 2⁵ = 28999577 is a prime.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (28999699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14499804 + 14499805.

It is an arithmetic number, because the mean of its divisors is an integer number (14499805).

Almost surely, 2^28999609 is an apocalyptic number.

It is an amenable number.

28999609 is a deficient number, since it is larger than the sum of its proper divisors (1).

28999609 is an equidigital number, since it uses as much as digits as its factorization.

28999609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 28999609 is about 5385.1285035735. The cubic root of 28999609 is about 307.2303017855.

The spelling of 28999609 in words is "twenty-eight million, nine hundred ninety-nine thousand, six hundred nine".