216355780 has 24 divisors (see below), whose sum is σ = 454886208. Its totient is φ = 86439648.

The previous prime is 216355759. The next prime is 216355781. The reversal of 216355780 is 87553612.

216355780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216355781) 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, 12177 + ... + 24103.

It is an arithmetic number, because the mean of its divisors is an integer number (18953592).

Almost surely, 2^216355780 is an apocalyptic number.

216355780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216355780 is an abundant number, since it is smaller than the sum of its proper divisors (238530428).

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

216355780 is a wasteful number, since it uses less digits than its factorization.

216355780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12843 (or 12841 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 216355780 is about 14709.0373580326. The cubic root of 216355780 is about 600.3292452222.

The spelling of 216355780 in words is "two hundred sixteen million, three hundred fifty-five thousand, seven hundred eighty".