71999917 has 8 divisors (see below), whose sum is σ = 80028000. Its totient is φ = 64218960.

The previous prime is 71999909. The next prime is 71999989.

71999917 is nontrivially palindromic in base 10.

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 71999917 - 2³ = 71999909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71999017) 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, 61167 + ... + 62332.

It is an arithmetic number, because the mean of its divisors is an integer number (10003500).

Almost surely, 2^71999917 is an apocalyptic number.

It is an amenable number.

71999917 is a deficient number, since it is larger than the sum of its proper divisors (8028083).

71999917 is a wasteful number, since it uses less digits than its factorization.

71999917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123563.

The product of its digits is 321489, while the sum is 52.

The square root of 71999917 is about 8485.2764834153. The cubic root of 71999917 is about 416.0166047520.

The spelling of 71999917 in words is "seventy-one million, nine hundred ninety-nine thousand, nine hundred seventeen".