71656216 has 32 divisors (see below), whose sum is σ = 140925600. Its totient is φ = 34110720.

The previous prime is 71656199. The next prime is 71656217. The reversal of 71656216 is 61265617.

It is a happy number.

It is a super-2 number, since 2×71656216² = 10269226582877312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71656217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14821 + ... + 19051.

It is an arithmetic number, because the mean of its divisors is an integer number (4403925).

Almost surely, 2^71656216 is an apocalyptic number.

It is an amenable number.

71656216 is a deficient number, since it is larger than the sum of its proper divisors (69269384).

71656216 is a wasteful number, since it uses less digits than its factorization.

71656216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4339 (or 4335 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 71656216 is about 8464.9994683993. Note that the first 3 decimals coincide. The cubic root of 71656216 is about 415.3535787651.

The spelling of 71656216 in words is "seventy-one million, six hundred fifty-six thousand, two hundred sixteen".