216825380 has 24 divisors (see below), whose sum is σ = 455777280. Its totient is φ = 86645600.

The previous prime is 216825331. The next prime is 216825391. The reversal of 216825380 is 83528612.

It is a self number, because there is not a number n which added to its sum of digits gives 216825380.

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, 18311 + ... + 27729.

It is an arithmetic number, because the mean of its divisors is an integer number (18990720).

Almost surely, 2^216825380 is an apocalyptic number.

216825380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216825380 is an abundant number, since it is smaller than the sum of its proper divisors (238951900).

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

216825380 is a wasteful number, since it uses less digits than its factorization.

216825380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10579 (or 10577 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 216825380 is about 14724.9916808126. The cubic root of 216825380 is about 600.7632693621.

The spelling of 216825380 in words is "two hundred sixteen million, eight hundred twenty-five thousand, three hundred eighty".