71917042 has 16 divisors (see below), whose sum is σ = 112593240. Its totient is φ = 34408192.

The previous prime is 71917037. The next prime is 71917049. The reversal of 71917042 is 24071917.

It can be written as a sum of positive squares in 4 ways, for example, as 43837641 + 28079401 = 6621^2 + 5299^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71916995 and 71917013.

It is not an unprimeable number, because it can be changed into a prime (71917049) 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, 1068 + ... + 12040.

Almost surely, 2^71917042 is an apocalyptic number.

71917042 is a deficient number, since it is larger than the sum of its proper divisors (40676198).

71917042 is a wasteful number, since it uses less digits than its factorization.

71917042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11117.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 71917042 is about 8480.3916183157. The cubic root of 71917042 is about 415.8569258045.

Adding to 71917042 its reverse (24071917), we get a palindrome (95988959).

The spelling of 71917042 in words is "seventy-one million, nine hundred seventeen thousand, forty-two".