71688442 has 16 divisors (see below), whose sum is σ = 125510400. Its totient is φ = 30069648.

The previous prime is 71688437. The next prime is 71688457. The reversal of 71688442 is 24488617.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 71688395 and 71688404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53817 + ... + 55132.

It is an arithmetic number, because the mean of its divisors is an integer number (7844400).

Almost surely, 2^71688442 is an apocalyptic number.

71688442 is a deficient number, since it is larger than the sum of its proper divisors (53821958).

71688442 is a wasteful number, since it uses less digits than its factorization.

71688442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109005.

The product of its digits is 86016, while the sum is 40.

The square root of 71688442 is about 8466.9027394910. The cubic root of 71688442 is about 415.4158351847.

The spelling of 71688442 in words is "seventy-one million, six hundred eighty-eight thousand, four hundred forty-two".