71689285 has 16 divisors (see below), whose sum is σ = 87736176. Its totient is φ = 56222208.

The previous prime is 71689283. The next prime is 71689291. The reversal of 71689285 is 58298617.

It can be written as a sum of positive squares in 8 ways, for example, as 15634116 + 56055169 = 3954^2 + 7487^2 .

It is a cyclic number.

It is not a de Polignac number, because 71689285 - 2¹ = 71689283 is a prime.

It is a super-2 number, since 2×71689285² = 10278707167622450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71689283) 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 15 ways as a sum of consecutive naturals, for example, 71407 + ... + 72403.

It is an arithmetic number, because the mean of its divisors is an integer number (5483511).

Almost surely, 2^71689285 is an apocalyptic number.

It is an amenable number.

71689285 is a deficient number, since it is larger than the sum of its proper divisors (16046891).

71689285 is a wasteful number, since it uses less digits than its factorization.

71689285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272.

The product of its digits is 241920, while the sum is 46.

The square root of 71689285 is about 8466.9525214212. The cubic root of 71689285 is about 415.4174635001.

The spelling of 71689285 in words is "seventy-one million, six hundred eighty-nine thousand, two hundred eighty-five".