216134664 has 32 divisors (see below), whose sum is σ = 541645440. Its totient is φ = 71870400.

The previous prime is 216134663. The next prime is 216134701. The reversal of 216134664 is 466431612.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (216134663) 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, 592 + ... + 20799.

It is an arithmetic number, because the mean of its divisors is an integer number (16926420).

Almost surely, 2^216134664 is an apocalyptic number.

216134664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216134664 is an abundant number, since it is smaller than the sum of its proper divisors (325510776).

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

216134664 is a wasteful number, since it uses less digits than its factorization.

216134664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21821 (or 21817 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 216134664 is about 14701.5191051809. The cubic root of 216134664 is about 600.1246629857.

The spelling of 216134664 in words is "two hundred sixteen million, one hundred thirty-four thousand, six hundred sixty-four".