68906993 has 2 divisors, whose sum is σ = 68906994. Its totient is φ = 68906992.

The previous prime is 68906969. The next prime is 68907031. The reversal of 68906993 is 39960986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66308449 + 2598544 = 8143^2 + 1612^2 .

It is a cyclic number.

It is not a de Polignac number, because 68906993 - 2²⁶ = 1798129 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68906923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34453496 + 34453497.

It is an arithmetic number, because the mean of its divisors is an integer number (34453497).

Almost surely, 2^68906993 is an apocalyptic number.

It is an amenable number.

68906993 is a deficient number, since it is larger than the sum of its proper divisors (1).

68906993 is an equidigital number, since it uses as much as digits as its factorization.

68906993 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 50.

The square root of 68906993 is about 8301.0236115795. The cubic root of 68906993 is about 409.9722229843.

The spelling of 68906993 in words is "sixty-eight million, nine hundred six thousand, nine hundred ninety-three".