71599986 has 12 divisors (see below), whose sum is σ = 155133342. Its totient is φ = 23866656.

The previous prime is 71599963. The next prime is 71599993. The reversal of 71599986 is 68999517.

It can be written as a sum of positive squares in only one way, i.e., 71318025 + 281961 = 8445^2 + 531^2 .

It is an unprimeable number.

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, 1988871 + ... + 1988906.

Almost surely, 2^71599986 is an apocalyptic number.

71599986 is an abundant number, since it is smaller than the sum of its proper divisors (83533356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71599986 is a wasteful number, since it uses less digits than its factorization.

71599986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977785 (or 3977782 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 71599986 is about 8461.6774932634. The cubic root of 71599986 is about 415.2449050411.

The spelling of 71599986 in words is "seventy-one million, five hundred ninety-nine thousand, nine hundred eighty-six".