68723989 has 2 divisors, whose sum is σ = 68723990. Its totient is φ = 68723988.

The previous prime is 68723983. The next prime is 68724031. The reversal of 68723989 is 98932786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48094225 + 20629764 = 6935^2 + 4542^2 .

It is a cyclic number.

It is not a de Polignac number, because 68723989 - 2³ = 68723981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68723981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34361994 + 34361995.

It is an arithmetic number, because the mean of its divisors is an integer number (34361995).

Almost surely, 2^68723989 is an apocalyptic number.

It is an amenable number.

68723989 is a deficient number, since it is larger than the sum of its proper divisors (1).

68723989 is an equidigital number, since it uses as much as digits as its factorization.

68723989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 68723989 is about 8289.9933051843. The cubic root of 68723989 is about 409.6089648669.

The spelling of 68723989 in words is "sixty-eight million, seven hundred twenty-three thousand, nine hundred eighty-nine".