216983910 has 128 divisors (see below), whose sum is σ = 628798464. Its totient is φ = 47208960.

The previous prime is 216983867. The next prime is 216983929. The reversal of 216983910 is 19389612.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 158047 + ... + 159413.

It is an arithmetic number, because the mean of its divisors is an integer number (4912488).

Almost surely, 2^216983910 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216983910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314399232).

216983910 is an abundant number, since it is smaller than the sum of its proper divisors (411814554).

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

216983910 is a wasteful number, since it uses less digits than its factorization.

216983910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 216983910 is about 14730.3737223466. The cubic root of 216983910 is about 600.9096479818.

The spelling of 216983910 in words is "two hundred sixteen million, nine hundred eighty-three thousand, nine hundred ten".