71721116 has 24 divisors (see below), whose sum is σ = 128314704. Its totient is φ = 35066880.

The previous prime is 71721109. The next prime is 71721127. The reversal of 71721116 is 61112717.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46331 + ... + 47853.

It is an arithmetic number, because the mean of its divisors is an integer number (5346446).

Almost surely, 2^71721116 is an apocalyptic number.

It is an amenable number.

71721116 is a deficient number, since it is larger than the sum of its proper divisors (56593588).

71721116 is a wasteful number, since it uses less digits than its factorization.

71721116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781 (or 1779 counting only the distinct ones).

The product of its digits is 588, while the sum is 26.

The square root of 71721116 is about 8468.8320328130. The cubic root of 71721116 is about 415.4789380365.

The spelling of 71721116 in words is "seventy-one million, seven hundred twenty-one thousand, one hundred sixteen".