216464564 has 24 divisors (see below), whose sum is σ = 384894720. Its totient is φ = 106501824.

The previous prime is 216464551. The next prime is 216464579. The reversal of 216464564 is 465464612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250397 + ... + 251259.

It is an arithmetic number, because the mean of its divisors is an integer number (16037280).

Almost surely, 2^216464564 is an apocalyptic number.

It is an amenable number.

216464564 is a deficient number, since it is larger than the sum of its proper divisors (168430156).

216464564 is a wasteful number, since it uses less digits than its factorization.

216464564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799 (or 1797 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 216464564 is about 14712.7347559861. The cubic root of 216464564 is about 600.4298438354.

The spelling of 216464564 in words is "two hundred sixteen million, four hundred sixty-four thousand, five hundred sixty-four".