67981671 has 12 divisors (see below), whose sum is σ = 99300240. Its totient is φ = 44811360.

The previous prime is 67981637. The next prime is 67981679. The reversal of 67981671 is 17618976.

It is a de Polignac number, because none of the positive numbers 2^k-67981671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67981679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41635 + ... + 43236.

It is an arithmetic number, because the mean of its divisors is an integer number (8275020).

Almost surely, 2^67981671 is an apocalyptic number.

67981671 is a deficient number, since it is larger than the sum of its proper divisors (31318569).

67981671 is a wasteful number, since it uses less digits than its factorization.

67981671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84966 (or 84963 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 67981671 is about 8245.0998174673. The cubic root of 67981671 is about 408.1288340255.

The spelling of 67981671 in words is "sixty-seven million, nine hundred eighty-one thousand, six hundred seventy-one".