216365720 has 32 divisors (see below), whose sum is σ = 487825200. Its totient is φ = 86368128.

The previous prime is 216365717. The next prime is 216365729. The reversal of 216365720 is 27563612.

216365720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216365720² = 93628249582236800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216365729) 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, 15047 + ... + 25673.

Almost surely, 2^216365720 is an apocalyptic number.

216365720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216365720 is an abundant number, since it is smaller than the sum of its proper divisors (271459480).

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

216365720 is a wasteful number, since it uses less digits than its factorization.

216365720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11147 (or 11143 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 216365720 is about 14709.3752416614. The cubic root of 216365720 is about 600.3384386925.

The spelling of 216365720 in words is "two hundred sixteen million, three hundred sixty-five thousand, seven hundred twenty".