68644399 has 2 divisors, whose sum is σ = 68644400. Its totient is φ = 68644398.

The previous prime is 68644369. The next prime is 68644409. The reversal of 68644399 is 99344686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68644399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68644319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34322199 + 34322200.

It is an arithmetic number, because the mean of its divisors is an integer number (34322200).

Almost surely, 2^68644399 is an apocalyptic number.

68644399 is a deficient number, since it is larger than the sum of its proper divisors (1).

68644399 is an equidigital number, since it uses as much as digits as its factorization.

68644399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 49.

The square root of 68644399 is about 8285.1915487815. The cubic root of 68644399 is about 409.4507795850.

The spelling of 68644399 in words is "sixty-eight million, six hundred forty-four thousand, three hundred ninety-nine".