216716646 has 32 divisors (see below), whose sum is σ = 469611648. Its totient is φ = 66407040.

The previous prime is 216716639. The next prime is 216716651. The reversal of 216716646 is 646617612.

It is a super-2 number, since 2×216716646² = 93932209306978632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20320 + ... + 29091.

It is an arithmetic number, because the mean of its divisors is an integer number (14675364).

Almost surely, 2^216716646 is an apocalyptic number.

216716646 is an abundant number, since it is smaller than the sum of its proper divisors (252895002).

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

216716646 is a wasteful number, since it uses less digits than its factorization.

216716646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49476.

The product of its digits is 72576, while the sum is 39.

The square root of 216716646 is about 14721.2990595260. The cubic root of 216716646 is about 600.6628286052.

The spelling of 216716646 in words is "two hundred sixteen million, seven hundred sixteen thousand, six hundred forty-six".