68804621 has 2 divisors, whose sum is σ = 68804622. Its totient is φ = 68804620.

The previous prime is 68804597. The next prime is 68804623. The reversal of 68804621 is 12640886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45630025 + 23174596 = 6755^2 + 4814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68804621 is a prime.

Together with 68804623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68804623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34402310 + 34402311.

It is an arithmetic number, because the mean of its divisors is an integer number (34402311).

Almost surely, 2^68804621 is an apocalyptic number.

It is an amenable number.

68804621 is a deficient number, since it is larger than the sum of its proper divisors (1).

68804621 is an equidigital number, since it uses as much as digits as its factorization.

68804621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 68804621 is about 8294.8550921641. The cubic root of 68804621 is about 409.7690966353.

The spelling of 68804621 in words is "sixty-eight million, eight hundred four thousand, six hundred twenty-one".