816512216 has 32 divisors (see below), whose sum is σ = 1650054000. Its totient is φ = 376548480.

The previous prime is 816512173. The next prime is 816512233. The reversal of 816512216 is 612215618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174386 + ... + 179006.

Almost surely, 2^816512216 is an apocalyptic number.

It is an amenable number.

816512216 is an abundant number, since it is smaller than the sum of its proper divisors (833541784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816512216 is a wasteful number, since it uses less digits than its factorization.

816512216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6339 (or 6335 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 816512216 is about 28574.6778809491. The cubic root of 816512216 is about 934.6612310426.

The spelling of 816512216 in words is "eight hundred sixteen million, five hundred twelve thousand, two hundred sixteen".