216123808 has 24 divisors (see below), whose sum is σ = 436995972. Its totient is φ = 105140736.

The previous prime is 216123799. The next prime is 216123821. The reversal of 216123808 is 808321612.

It can be written as a sum of positive squares in 2 ways, for example, as 198584464 + 17539344 = 14092^2 + 4188^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216123808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90085 + ... + 92452.

Almost surely, 2^216123808 is an apocalyptic number.

It is an amenable number.

216123808 is an abundant number, since it is smaller than the sum of its proper divisors (220872164).

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

216123808 is a wasteful number, since it uses less digits than its factorization.

216123808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182584 (or 182576 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 216123808 is about 14701.1498869986. The cubic root of 216123808 is about 600.1146151413.

The spelling of 216123808 in words is "two hundred sixteen million, one hundred twenty-three thousand, eight hundred eight".