217996992 has 42 divisors (see below), whose sum is σ = 624850668. Its totient is φ = 72665472.

The previous prime is 217996979. The next prime is 217997009. The reversal of 217996992 is 299699712.

217996992 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 188658 + ... + 189809.

Almost surely, 2^217996992 is an apocalyptic number.

It is an amenable number.

217996992 is an abundant number, since it is smaller than the sum of its proper divisors (406853676).

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

217996992 is a wasteful number, since it uses less digits than its factorization.

217996992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378485 (or 378472 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 217996992 is about 14764.7211961486. The cubic root of 217996992 is about 601.8433973437.

The spelling of 217996992 in words is "two hundred seventeen million, nine hundred ninety-six thousand, nine hundred ninety-two".