71672321 has 8 divisors (see below), whose sum is σ = 83654400. Its totient is φ = 60126048.

The previous prime is 71672317. The next prime is 71672329. The reversal of 71672321 is 12327617.

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 71672321 - 2² = 71672317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71672329) 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, 108596 + ... + 109253.

It is an arithmetic number, because the mean of its divisors is an integer number (10456800).

Almost surely, 2^71672321 is an apocalyptic number.

It is an amenable number.

71672321 is a deficient number, since it is larger than the sum of its proper divisors (11982079).

71672321 is a wasteful number, since it uses less digits than its factorization.

71672321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217903.

The product of its digits is 3528, while the sum is 29.

The square root of 71672321 is about 8465.9506849497. The cubic root of 71672321 is about 415.3846938526.

Adding to 71672321 its reverse (12327617), we get a palindrome (83999938).

It can be divided in two parts, 716 and 72321, that added together give a palindrome (73037).

The spelling of 71672321 in words is "seventy-one million, six hundred seventy-two thousand, three hundred twenty-one".