71989215 has 8 divisors (see below), whose sum is σ = 115182768. Its totient is φ = 38394240.

The previous prime is 71989189. The next prime is 71989217. The reversal of 71989215 is 51298917.

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

It is not a de Polignac number, because 71989215 - 2⁹ = 71988703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71989217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2399626 + ... + 2399655.

It is an arithmetic number, because the mean of its divisors is an integer number (14397846).

Almost surely, 2^71989215 is an apocalyptic number.

71989215 is a deficient number, since it is larger than the sum of its proper divisors (43193553).

71989215 is a wasteful number, since it uses less digits than its factorization.

71989215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4799289.

The product of its digits is 45360, while the sum is 42.

The square root of 71989215 is about 8484.6458382186. The cubic root of 71989215 is about 415.9959916250.

The spelling of 71989215 in words is "seventy-one million, nine hundred eighty-nine thousand, two hundred fifteen".