71681612 has 12 divisors (see below), whose sum is σ = 128502696. Its totient is φ = 34966560.

The previous prime is 71681609. The next prime is 71681629. The reversal of 71681612 is 21618617.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 218378 + ... + 218705.

It is an arithmetic number, because the mean of its divisors is an integer number (10708558).

Almost surely, 2^71681612 is an apocalyptic number.

It is an amenable number.

71681612 is a deficient number, since it is larger than the sum of its proper divisors (56821084).

71681612 is a wasteful number, since it uses less digits than its factorization.

71681612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437128 (or 437126 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 71681612 is about 8466.4993946731. The cubic root of 71681612 is about 415.4026420758.

It can be divided in two parts, 716 and 81612, that added together give a palindrome (82328).

The spelling of 71681612 in words is "seventy-one million, six hundred eighty-one thousand, six hundred twelve".