216207680 has 56 divisors (see below), whose sum is σ = 554458632. Its totient is φ = 79828992.

The previous prime is 216207679. The next prime is 216207701. The reversal of 216207680 is 86702612.

It can be written as a sum of positive squares in 4 ways, for example, as 64 + 216207616 = 8^2 + 14704^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21827 + ... + 30146.

It is an arithmetic number, because the mean of its divisors is an integer number (9901047).

Almost surely, 2^216207680 is an apocalyptic number.

216207680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216207680 is an abundant number, since it is smaller than the sum of its proper divisors (338250952).

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

216207680 is a wasteful number, since it uses less digits than its factorization.

216207680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52003 (or 51993 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 216207680 is about 14704.0021762784. The cubic root of 216207680 is about 600.1922346994.

The spelling of 216207680 in words is "two hundred sixteen million, two hundred seven thousand, six hundred eighty".