71821706 has 16 divisors (see below), whose sum is σ = 118693728. Its totient is φ = 32322000.

The previous prime is 71821697. The next prime is 71821723. The reversal of 71821706 is 60712817.

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, 13940 + ... + 18383.

It is an arithmetic number, because the mean of its divisors is an integer number (7418358).

Almost surely, 2^71821706 is an apocalyptic number.

71821706 is a deficient number, since it is larger than the sum of its proper divisors (46872022).

71821706 is a wasteful number, since it uses less digits than its factorization.

71821706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32437.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 71821706 is about 8474.7687874065. The cubic root of 71821706 is about 415.6730858944.

Subtracting from 71821706 its reverse (60712817), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 71821 and 706, that added together give a palindrome (72527).

The spelling of 71821706 in words is "seventy-one million, eight hundred twenty-one thousand, seven hundred six".