67889971 has 2 divisors, whose sum is σ = 67889972. Its totient is φ = 67889970.

The previous prime is 67889903. The next prime is 67889981. The reversal of 67889971 is 17998876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67889971 - 2¹⁵ = 67857203 is a prime.

It is not a weakly prime, because it can be changed into another prime (67889981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33944985 + 33944986.

It is an arithmetic number, because the mean of its divisors is an integer number (33944986).

Almost surely, 2^67889971 is an apocalyptic number.

67889971 is a deficient number, since it is larger than the sum of its proper divisors (1).

67889971 is an equidigital number, since it uses as much as digits as its factorization.

67889971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 55.

The square root of 67889971 is about 8239.5370622384. The cubic root of 67889971 is about 407.9452440775.

The spelling of 67889971 in words is "sixty-seven million, eight hundred eighty-nine thousand, nine hundred seventy-one".