71718957 has 6 divisors (see below), whose sum is σ = 103594062. Its totient is φ = 47812632.

The previous prime is 71718947. The next prime is 71718961. The reversal of 71718957 is 75981717.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 53494596 + 18224361 = 7314^2 + 4269^2 .

It is not a de Polignac number, because 71718957 - 2¹² = 71714861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71718947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3984378 + ... + 3984395.

It is an arithmetic number, because the mean of its divisors is an integer number (17265677).

Almost surely, 2^71718957 is an apocalyptic number.

It is an amenable number.

71718957 is a deficient number, since it is larger than the sum of its proper divisors (31875105).

71718957 is a wasteful number, since it uses less digits than its factorization.

71718957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7968779 (or 7968776 counting only the distinct ones).

The product of its digits is 123480, while the sum is 45.

The square root of 71718957 is about 8468.7045644538. The cubic root of 71718957 is about 415.4747689806.

The spelling of 71718957 in words is "seventy-one million, seven hundred eighteen thousand, nine hundred fifty-seven".