71563616 has 12 divisors (see below), whose sum is σ = 140890932. Its totient is φ = 35781792.

The previous prime is 71563607. The next prime is 71563631. The reversal of 71563616 is 61636517.

It is a happy number.

It is a super-2 number, since 2×71563616² = 10242702269990912, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1118150 + ... + 1118213.

It is an arithmetic number, because the mean of its divisors is an integer number (11740911).

Almost surely, 2^71563616 is an apocalyptic number.

It is an amenable number.

71563616 is a deficient number, since it is larger than the sum of its proper divisors (69327316).

71563616 is a wasteful number, since it uses less digits than its factorization.

71563616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236373 (or 2236365 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 71563616 is about 8459.5281192275. The cubic root of 71563616 is about 415.1745837281.

The spelling of 71563616 in words is "seventy-one million, five hundred sixty-three thousand, six hundred sixteen".