67999971 has 8 divisors (see below), whose sum is σ = 97641040. Its totient is φ = 41846112.

The previous prime is 67999927. The next prime is 67999973. The reversal of 67999971 is 17999976.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67999971 - 2¹³ = 67991779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67999973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871756 + ... + 871833.

It is an arithmetic number, because the mean of its divisors is an integer number (12205130).

Almost surely, 2^67999971 is an apocalyptic number.

67999971 is a deficient number, since it is larger than the sum of its proper divisors (29641069).

67999971 is a wasteful number, since it uses less digits than its factorization.

67999971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743605.

The product of its digits is 1928934, while the sum is 57.

The square root of 67999971 is about 8246.2094928519. The cubic root of 67999971 is about 408.1654521682.

The spelling of 67999971 in words is "sixty-seven million, nine hundred ninety-nine thousand, nine hundred seventy-one".