67720879 has 2 divisors, whose sum is σ = 67720880. Its totient is φ = 67720878.

The previous prime is 67720847. The next prime is 67720897. The reversal of 67720879 is 97802776.

Together with next prime (67720897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67720879 - 2⁵ = 67720847 is a prime.

It is a super-2 number, since 2×67720879² = 9172234905065282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67721879) 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, 33860439 + 33860440.

It is an arithmetic number, because the mean of its divisors is an integer number (33860440).

Almost surely, 2^67720879 is an apocalyptic number.

67720879 is a deficient number, since it is larger than the sum of its proper divisors (1).

67720879 is an equidigital number, since it uses as much as digits as its factorization.

67720879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 67720879 is about 8229.2696516763. The cubic root of 67720879 is about 407.6062758678.

The spelling of 67720879 in words is "sixty-seven million, seven hundred twenty thousand, eight hundred seventy-nine".