216909468 has 24 divisors (see below), whose sum is σ = 562358160. Its totient is φ = 72303120.

The previous prime is 216909467. The next prime is 216909533. The reversal of 216909468 is 864909612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216909463) 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, 1004103 + ... + 1004318.

It is an arithmetic number, because the mean of its divisors is an integer number (23431590).

Almost surely, 2^216909468 is an apocalyptic number.

It is an amenable number.

216909468 is an abundant number, since it is smaller than the sum of its proper divisors (345448692).

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

216909468 is a wasteful number, since it uses less digits than its factorization.

216909468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008434 (or 2008426 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 216909468 is about 14727.8466857854. The cubic root of 216909468 is about 600.8409208695.

The spelling of 216909468 in words is "two hundred sixteen million, nine hundred nine thousand, four hundred sixty-eight".