76667321 has 2 divisors, whose sum is σ = 76667322. Its totient is φ = 76667320.

The previous prime is 76667317. The next prime is 76667347. The reversal of 76667321 is 12376667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76125625 + 541696 = 8725^2 + 736^2 .

It is an emirp because it is prime and its reverse (12376667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76667321 - 2² = 76667317 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76667351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38333660 + 38333661.

It is an arithmetic number, because the mean of its divisors is an integer number (38333661).

Almost surely, 2^76667321 is an apocalyptic number.

It is an amenable number.

76667321 is a deficient number, since it is larger than the sum of its proper divisors (1).

76667321 is an equidigital number, since it uses as much as digits as its factorization.

76667321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 76667321 is about 8755.9877226958. The cubic root of 76667321 is about 424.8185079738.

The spelling of 76667321 in words is "seventy-six million, six hundred sixty-seven thousand, three hundred twenty-one".