71323721 has 8 divisors (see below), whose sum is σ = 86307840. Its totient is φ = 57538368.

The previous prime is 71323717. The next prime is 71323727. The reversal of 71323721 is 12732317.

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 71323721 - 2² = 71323717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71323727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299561 + ... + 299798.

It is an arithmetic number, because the mean of its divisors is an integer number (10788480).

Almost surely, 2^71323721 is an apocalyptic number.

It is an amenable number.

71323721 is a deficient number, since it is larger than the sum of its proper divisors (14984119).

71323721 is a wasteful number, since it uses less digits than its factorization.

71323721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599383.

The product of its digits is 1764, while the sum is 26.

The square root of 71323721 is about 8445.3372342376. The cubic root of 71323721 is about 414.7101493738.

The spelling of 71323721 in words is "seventy-one million, three hundred twenty-three thousand, seven hundred twenty-one".