71721699 has 8 divisors (see below), whose sum is σ = 109290240. Its totient is φ = 40983816.

The previous prime is 71721649. The next prime is 71721701. The reversal of 71721699 is 99612717.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71721699 - 2⁹ = 71721187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71721699.

It is not an unprimeable number, because it can be changed into a prime (71721649) 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, 1707639 + ... + 1707680.

It is an arithmetic number, because the mean of its divisors is an integer number (13661280).

Almost surely, 2^71721699 is an apocalyptic number.

71721699 is a deficient number, since it is larger than the sum of its proper divisors (37568541).

71721699 is a wasteful number, since it uses less digits than its factorization.

71721699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415329.

The product of its digits is 47628, while the sum is 42.

The square root of 71721699 is about 8468.8664530739. The cubic root of 71721699 is about 415.4800638024.

The spelling of 71721699 in words is "seventy-one million, seven hundred twenty-one thousand, six hundred ninety-nine".