216810264 has 64 divisors (see below), whose sum is σ = 611712000. Its totient is φ = 63432320.

The previous prime is 216810263. The next prime is 216810271. The reversal of 216810264 is 462018612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216810263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6504 + ... + 21815.

It is an arithmetic number, because the mean of its divisors is an integer number (9558000).

Almost surely, 2^216810264 is an apocalyptic number.

216810264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216810264 is an abundant number, since it is smaller than the sum of its proper divisors (394901736).

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

216810264 is a wasteful number, since it uses less digits than its factorization.

216810264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28368 (or 28364 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 216810264 is about 14724.4783948363. The cubic root of 216810264 is about 600.7493082834.

Adding to 216810264 its reverse (462018612), we get a palindrome (678828876).

The spelling of 216810264 in words is "two hundred sixteen million, eight hundred ten thousand, two hundred sixty-four".