216908860 has 192 divisors, whose sum is σ = 585252864. Its totient is φ = 65894400.

The previous prime is 216908851. The next prime is 216908869. The reversal of 216908860 is 68809612.

It is an interprime number because it is at equal distance from previous prime (216908851) and next prime (216908869).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216908869) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4092594 + ... + 4092646.

It is an arithmetic number, because the mean of its divisors is an integer number (3048192).

Almost surely, 2^216908860 is an apocalyptic number.

216908860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216908860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292626432).

216908860 is an abundant number, since it is smaller than the sum of its proper divisors (368344004).

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

216908860 is a wasteful number, since it uses less digits than its factorization.

216908860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 216908860 is about 14727.8260446001. The cubic root of 216908860 is about 600.8403594808.

The spelling of 216908860 in words is "two hundred sixteen million, nine hundred eight thousand, eight hundred sixty".