67564979 has 2 divisors, whose sum is σ = 67564980. Its totient is φ = 67564978.

The previous prime is 67564951. The next prime is 67564993. The reversal of 67564979 is 97946576.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67564979 - 2⁸ = 67564723 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67564979.

It is not a weakly prime, because it can be changed into another prime (67564909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33782489 + 33782490.

It is an arithmetic number, because the mean of its divisors is an integer number (33782490).

Almost surely, 2^67564979 is an apocalyptic number.

67564979 is a deficient number, since it is larger than the sum of its proper divisors (1).

67564979 is an equidigital number, since it uses as much as digits as its factorization.

67564979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 53.

The square root of 67564979 is about 8219.7919073417. The cubic root of 67564979 is about 407.2932525448.

The spelling of 67564979 in words is "sixty-seven million, five hundred sixty-four thousand, nine hundred seventy-nine".