67856977 has 2 divisors, whose sum is σ = 67856978. Its totient is φ = 67856976.

The previous prime is 67856963. The next prime is 67856981. The reversal of 67856977 is 77965876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67831696 + 25281 = 8236^2 + 159^2 .

It is a cyclic number.

It is not a de Polignac number, because 67856977 - 2²³ = 59468369 is a prime.

It is not a weakly prime, because it can be changed into another prime (67853977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33928488 + 33928489.

It is an arithmetic number, because the mean of its divisors is an integer number (33928489).

Almost surely, 2^67856977 is an apocalyptic number.

It is an amenable number.

67856977 is a deficient number, since it is larger than the sum of its proper divisors (1).

67856977 is an equidigital number, since it uses as much as digits as its factorization.

67856977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 55.

The square root of 67856977 is about 8237.5346433262. The cubic root of 67856977 is about 407.8791472927.

The spelling of 67856977 in words is "sixty-seven million, eight hundred fifty-six thousand, nine hundred seventy-seven".