216778120 has 32 divisors (see below), whose sum is σ = 525271320. Its totient is φ = 80040960.

The previous prime is 216778117. The next prime is 216778127. The reversal of 216778120 is 21877612.

It is a happy number.

216778120 is digitally balanced in base 2, 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 4 ways, for example, as 130919364 + 85858756 = 11442^2 + 9266^2 .

It is not an unprimeable number, because it can be changed into a prime (216778127) 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, 207921 + ... + 208960.

Almost surely, 2^216778120 is an apocalyptic number.

216778120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216778120 is an abundant number, since it is smaller than the sum of its proper divisors (308493200).

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

216778120 is a wasteful number, since it uses less digits than its factorization.

216778120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416905 (or 416901 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 216778120 is about 14723.3868386319. The cubic root of 216778120 is about 600.7196180529.

The spelling of 216778120 in words is "two hundred sixteen million, seven hundred seventy-eight thousand, one hundred twenty".