71640067 has 4 divisors (see below), whose sum is σ = 71683416. Its totient is φ = 71596720.

The previous prime is 71640059. The next prime is 71640073. The reversal of 71640067 is 76004617.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71640067 - 2³ = 71640059 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71640167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19093 + ... + 22534.

It is an arithmetic number, because the mean of its divisors is an integer number (17920854).

Almost surely, 2^71640067 is an apocalyptic number.

71640067 is a deficient number, since it is larger than the sum of its proper divisors (43349).

71640067 is a wasteful number, since it uses less digits than its factorization.

71640067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43348.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 71640067 is about 8464.0455457187. The cubic root of 71640067 is about 415.3223739873.

The spelling of 71640067 in words is "seventy-one million, six hundred forty thousand, sixty-seven".