71663936 has 28 divisors (see below), whose sum is σ = 142794228. Its totient is φ = 35684352.

The previous prime is 71663923. The next prime is 71663983. The reversal of 71663936 is 63936617.

It can be written as a sum of positive squares in 2 ways, for example, as 71233600 + 430336 = 8440^2 + 656^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71663893 and 71663902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14270 + ... + 18626.

Almost surely, 2^71663936 is an apocalyptic number.

It is an amenable number.

71663936 is a deficient number, since it is larger than the sum of its proper divisors (71130292).

71663936 is a wasteful number, since it uses less digits than its factorization.

71663936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4626 (or 4616 counting only the distinct ones).

The product of its digits is 122472, while the sum is 41.

The square root of 71663936 is about 8465.4554514214. The cubic root of 71663936 is about 415.3684944959.

The spelling of 71663936 in words is "seventy-one million, six hundred sixty-three thousand, nine hundred thirty-six".