67973987 has 2 divisors, whose sum is σ = 67973988. Its totient is φ = 67973986.

The previous prime is 67973981. The next prime is 67974019. The reversal of 67973987 is 78937976.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67973987 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67973981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33986993 + 33986994.

It is an arithmetic number, because the mean of its divisors is an integer number (33986994).

Almost surely, 2^67973987 is an apocalyptic number.

67973987 is a deficient number, since it is larger than the sum of its proper divisors (1).

67973987 is an equidigital number, since it uses as much as digits as its factorization.

67973987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4000752, while the sum is 56.

The square root of 67973987 is about 8244.6338305591. The cubic root of 67973987 is about 408.1134564486.

The spelling of 67973987 in words is "sixty-seven million, nine hundred seventy-three thousand, nine hundred eighty-seven".