71664412 has 36 divisors (see below), whose sum is σ = 134734320. Its totient is φ = 33289344.

The previous prime is 71664403. The next prime is 71664421. The reversal of 71664412 is 21446617.

It is an interprime number because it is at equal distance from previous prime (71664403) and next prime (71664421).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125664 + ... + 126232.

It is an arithmetic number, because the mean of its divisors is an integer number (3742620).

Almost surely, 2^71664412 is an apocalyptic number.

It is an amenable number.

71664412 is a deficient number, since it is larger than the sum of its proper divisors (63069908).

71664412 is a wasteful number, since it uses less digits than its factorization.

71664412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 631 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 71664412 is about 8465.4835656329. The cubic root of 71664412 is about 415.3694141354.

The spelling of 71664412 in words is "seventy-one million, six hundred sixty-four thousand, four hundred twelve".