71257706 has 16 divisors (see below), whose sum is σ = 115256904. Its totient is φ = 32845824.

The previous prime is 71257679. The next prime is 71257717. The reversal of 71257706 is 60775217.

It can be written as a sum of positive squares in 4 ways, for example, as 55726225 + 15531481 = 7465^2 + 3941^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28790 + ... + 31166.

Almost surely, 2^71257706 is an apocalyptic number.

71257706 is a deficient number, since it is larger than the sum of its proper divisors (43999198).

71257706 is a wasteful number, since it uses less digits than its factorization.

71257706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 71257706 is about 8441.4279597708. The cubic root of 71257706 is about 414.5821623080.

The spelling of 71257706 in words is "seventy-one million, two hundred fifty-seven thousand, seven hundred six".