68400641 has 2 divisors, whose sum is σ = 68400642. Its totient is φ = 68400640.

The previous prime is 68400637. The next prime is 68400677. The reversal of 68400641 is 14600486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36240400 + 32160241 = 6020^2 + 5671^2 .

It is a cyclic number.

It is not a de Polignac number, because 68400641 - 2² = 68400637 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 (68400691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34200320 + 34200321.

It is an arithmetic number, because the mean of its divisors is an integer number (34200321).

Almost surely, 2^68400641 is an apocalyptic number.

It is an amenable number.

68400641 is a deficient number, since it is larger than the sum of its proper divisors (1).

68400641 is an equidigital number, since it uses as much as digits as its factorization.

68400641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 68400641 is about 8270.4680036864. The cubic root of 68400641 is about 408.9655480771.

The spelling of 68400641 in words is "sixty-eight million, four hundred thousand, six hundred forty-one".