71672161 has 8 divisors (see below), whose sum is σ = 82303200. Its totient is φ = 61727040.

The previous prime is 71672089. The next prime is 71672173. The reversal of 71672161 is 16127617.

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

It is a cyclic number.

It is not a de Polignac number, because 71672161 - 2⁷ = 71672033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71675161) 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, 171256 + ... + 171673.

It is an arithmetic number, because the mean of its divisors is an integer number (10287900).

Almost surely, 2^71672161 is an apocalyptic number.

It is an amenable number.

71672161 is a deficient number, since it is larger than the sum of its proper divisors (10631039).

71672161 is a wasteful number, since it uses less digits than its factorization.

71672161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342959.

The product of its digits is 3528, while the sum is 31.

The square root of 71672161 is about 8465.9412353264. The cubic root of 71672161 is about 415.3843847533.

Adding to 71672161 its reverse (16127617), we get a palindrome (87799778).

The spelling of 71672161 in words is "seventy-one million, six hundred seventy-two thousand, one hundred sixty-one".