71596721 has 8 divisors (see below), whose sum is σ = 82946304. Its totient is φ = 60527520.

The previous prime is 71596717. The next prime is 71596729. The reversal of 71596721 is 12769517.

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 71596721 - 2² = 71596717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71596729) 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, 69545 + ... + 70566.

It is an arithmetic number, because the mean of its divisors is an integer number (10368288).

Almost surely, 2^71596721 is an apocalyptic number.

It is an amenable number.

71596721 is a deficient number, since it is larger than the sum of its proper divisors (11349583).

71596721 is a wasteful number, since it uses less digits than its factorization.

71596721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140191.

The product of its digits is 26460, while the sum is 38.

The square root of 71596721 is about 8461.4845624157. The cubic root of 71596721 is about 415.2385931440.

The spelling of 71596721 in words is "seventy-one million, five hundred ninety-six thousand, seven hundred twenty-one".