216629880 has 64 divisors (see below), whose sum is σ = 654683040. Its totient is φ = 57341952.

The previous prime is 216629879. The next prime is 216629899. The reversal of 216629880 is 88926612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9852 + ... + 23028.

Almost surely, 2^216629880 is an apocalyptic number.

216629880 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 216629880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327341520).

216629880 is an abundant number, since it is smaller than the sum of its proper divisors (438053160).

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

216629880 is a wasteful number, since it uses less digits than its factorization.

216629880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13328 (or 13324 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 216629880 is about 14718.3518099005. The cubic root of 216629880 is about 600.5826562253.

The spelling of 216629880 in words is "two hundred sixteen million, six hundred twenty-nine thousand, eight hundred eighty".