68399489 has 2 divisors, whose sum is σ = 68399490. Its totient is φ = 68399488.

The previous prime is 68399477. The next prime is 68399491. The reversal of 68399489 is 98499386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 10029889 = 7640^2 + 3167^2 .

It is a cyclic number.

It is not a de Polignac number, because 68399489 - 2⁴ = 68399473 is a prime.

It is a super-2 number, since 2×68399489² = 9356980190922242, which contains 22 as substring.

Together with 68399491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68399389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34199744 + 34199745.

It is an arithmetic number, because the mean of its divisors is an integer number (34199745).

Almost surely, 2^68399489 is an apocalyptic number.

It is an amenable number.

68399489 is a deficient number, since it is larger than the sum of its proper divisors (1).

68399489 is an equidigital number, since it uses as much as digits as its factorization.

68399489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 56.

The square root of 68399489 is about 8270.3983579995. The cubic root of 68399489 is about 408.9632521388.

The spelling of 68399489 in words is "sixty-eight million, three hundred ninety-nine thousand, four hundred eighty-nine".