67977967 has 2 divisors, whose sum is σ = 67977968. Its totient is φ = 67977966.

The previous prime is 67977937. The next prime is 67977977. The reversal of 67977967 is 76977976.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67977967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67977937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33988983 + 33988984.

It is an arithmetic number, because the mean of its divisors is an integer number (33988984).

Almost surely, 2^67977967 is an apocalyptic number.

67977967 is a deficient number, since it is larger than the sum of its proper divisors (1).

67977967 is an equidigital number, since it uses as much as digits as its factorization.

67977967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7001316, while the sum is 58.

The square root of 67977967 is about 8244.8751961446. The cubic root of 67977967 is about 408.1214215537.

Subtracting 67977967 from its reverse (76977976), we obtain a palindrome (9000009).

The spelling of 67977967 in words is "sixty-seven million, nine hundred seventy-seven thousand, nine hundred sixty-seven".