67390979 has 2 divisors, whose sum is σ = 67390980. Its totient is φ = 67390978.

The previous prime is 67390963. The next prime is 67390987. The reversal of 67390979 is 97909376.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67390979 - 2⁴ = 67390963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67390919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33695489 + 33695490.

It is an arithmetic number, because the mean of its divisors is an integer number (33695490).

Almost surely, 2^67390979 is an apocalyptic number.

67390979 is a deficient number, since it is larger than the sum of its proper divisors (1).

67390979 is an equidigital number, since it uses as much as digits as its factorization.

67390979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 642978, while the sum is 50.

The square root of 67390979 is about 8209.2008746284. The cubic root of 67390979 is about 406.9433180546.

The spelling of 67390979 in words is "sixty-seven million, three hundred ninety thousand, nine hundred seventy-nine".