217812964 has 12 divisors (see below), whose sum is σ = 384947388. Its totient is φ = 107828000.

The previous prime is 217812961. The next prime is 217812971. The reversal of 217812964 is 469218712.

It can be written as a sum of positive squares in 2 ways, for example, as 208571364 + 9241600 = 14442^2 + 3040^2 .

It is not an unprimeable number, because it can be changed into a prime (217812961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269167 + ... + 269974.

It is an arithmetic number, because the mean of its divisors is an integer number (32078949).

Almost surely, 2^217812964 is an apocalyptic number.

It is an amenable number.

217812964 is a deficient number, since it is larger than the sum of its proper divisors (167134424).

217812964 is a wasteful number, since it uses less digits than its factorization.

217812964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539246 (or 539244 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 217812964 is about 14758.4878629215. The cubic root of 217812964 is about 601.6739955915.

The spelling of 217812964 in words is "two hundred seventeen million, eight hundred twelve thousand, nine hundred sixty-four".