71667730 has 8 divisors (see below), whose sum is σ = 129001932. Its totient is φ = 28667088.

The previous prime is 71667727. The next prime is 71667731. The reversal of 71667730 is 3776617.

It can be written as a sum of positive squares in 2 ways, for example, as 70946929 + 720801 = 8423^2 + 849^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 71667730.

It is not an unprimeable number, because it can be changed into a prime (71667731) 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, 3583377 + ... + 3583396.

Almost surely, 2^71667730 is an apocalyptic number.

71667730 is a deficient number, since it is larger than the sum of its proper divisors (57334202).

71667730 is a wasteful number, since it uses less digits than its factorization.

71667730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7166780.

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 71667730 is about 8465.6795356309. The cubic root of 71667730 is about 415.3758244508.

The spelling of 71667730 in words is "seventy-one million, six hundred sixty-seven thousand, seven hundred thirty".