71957215 has 8 divisors (see below), whose sum is σ = 94198608. Its totient is φ = 52332480.

The previous prime is 71957213. The next prime is 71957227. The reversal of 71957215 is 51275917.

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

It is not a de Polignac number, because 71957215 - 2¹ = 71957213 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 (71957213) 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, 654102 + ... + 654211.

It is an arithmetic number, because the mean of its divisors is an integer number (11774826).

Almost surely, 2^71957215 is an apocalyptic number.

71957215 is a deficient number, since it is larger than the sum of its proper divisors (22241393).

71957215 is a wasteful number, since it uses less digits than its factorization.

71957215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308329.

The product of its digits is 22050, while the sum is 37.

The square root of 71957215 is about 8482.7598692878. The cubic root of 71957215 is about 415.9343442210.

The spelling of 71957215 in words is "seventy-one million, nine hundred fifty-seven thousand, two hundred fifteen".