67764881 has 2 divisors, whose sum is σ = 67764882. Its totient is φ = 67764880.

The previous prime is 67764869. The next prime is 67764883. The reversal of 67764881 is 18846776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67092481 + 672400 = 8191^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 67764881 - 2⁶ = 67764817 is a prime.

It is a super-2 number, since 2×67764881² = 9184158193888322, which contains 22 as substring.

Together with 67764883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67764883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33882440 + 33882441.

It is an arithmetic number, because the mean of its divisors is an integer number (33882441).

Almost surely, 2^67764881 is an apocalyptic number.

It is an amenable number.

67764881 is a deficient number, since it is larger than the sum of its proper divisors (1).

67764881 is an equidigital number, since it uses as much as digits as its factorization.

67764881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 47.

The square root of 67764881 is about 8231.9427233187. The cubic root of 67764881 is about 407.6945382001.

The spelling of 67764881 in words is "sixty-seven million, seven hundred sixty-four thousand, eight hundred eighty-one".