216464 has 20 divisors (see below), whose sum is σ = 427056. Its totient is φ = 106272.

The previous prime is 216451. The next prime is 216481. The reversal of 216464 is 464612.

It is a happy number.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1247 + ... + 1409.

2²¹⁶⁴⁶⁴ is an apocalyptic number.

It is an amenable number.

216464 is a deficient number, since it is larger than the sum of its proper divisors (210592).

216464 is a wasteful number, since it uses less digits than its factorization.

216464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 248 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 216464 is about 465.2569182720. The cubic root of 216464 is about 60.0429322360.

The spelling of 216464 in words is "two hundred sixteen thousand, four hundred sixty-four".