216542864 has 10 divisors (see below), whose sum is σ = 419551830. Its totient is φ = 108271424.

The previous prime is 216542857. The next prime is 216542873. The reversal of 216542864 is 468245612.

216542864 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 118374400 + 98168464 = 10880^2 + 9908^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6766949 + ... + 6766980.

It is an arithmetic number, because the mean of its divisors is an integer number (41955183).

Almost surely, 2^216542864 is an apocalyptic number.

It is an amenable number.

216542864 is a deficient number, since it is larger than the sum of its proper divisors (203008966).

216542864 is a wasteful number, since it uses less digits than its factorization.

216542864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13533937 (or 13533931 counting only the distinct ones).

The product of its digits is 92160, while the sum is 38.

The square root of 216542864 is about 14715.3954754876. The cubic root of 216542864 is about 600.5022313407.

The spelling of 216542864 in words is "two hundred sixteen million, five hundred forty-two thousand, eight hundred sixty-four".