71672817 has 4 divisors (see below), whose sum is σ = 95563760. Its totient is φ = 47781876.

The previous prime is 71672813. The next prime is 71672827. The reversal of 71672817 is 71827617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71827617 = 3 ⋅23942539.

It is not a de Polignac number, because 71672817 - 2² = 71672813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71672813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11945467 + ... + 11945472.

It is an arithmetic number, because the mean of its divisors is an integer number (23890940).

Almost surely, 2^71672817 is an apocalyptic number.

It is an amenable number.

71672817 is a deficient number, since it is larger than the sum of its proper divisors (23890943).

71672817 is a wasteful number, since it uses less digits than its factorization.

71672817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23890942.

The product of its digits is 32928, while the sum is 39.

The square root of 71672817 is about 8465.9799787148. The cubic root of 71672817 is about 415.3856520577.

The spelling of 71672817 in words is "seventy-one million, six hundred seventy-two thousand, eight hundred seventeen".