71999993 has 8 divisors (see below), whose sum is σ = 77606088. Its totient is φ = 66403584.

The previous prime is 71999989. The next prime is 71999999. The reversal of 71999993 is 39999917.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5626384 + 66373609 = 2372^2 + 8147^2 .

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

It is not a de Polignac number, because 71999993 - 2² = 71999989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71999999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22871 + ... + 25827.

It is an arithmetic number, because the mean of its divisors is an integer number (9700761).

Almost surely, 2^71999993 is an apocalyptic number.

It is an amenable number.

71999993 is a deficient number, since it is larger than the sum of its proper divisors (5606095).

71999993 is a wasteful number, since it uses less digits than its factorization.

71999993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4843.

The product of its digits is 1240029, while the sum is 56.

The square root of 71999993 is about 8485.2809617596. The cubic root of 71999993 is about 416.0167511284.

The spelling of 71999993 in words is "seventy-one million, nine hundred ninety-nine thousand, nine hundred ninety-three".