216649026 has 64 divisors (see below), whose sum is σ = 526953600. Its totient is φ = 65433600.

The previous prime is 216649021. The next prime is 216649031. The reversal of 216649026 is 620946612.

216649026 is a `hidden beast` number, since 2 + 1 + 6 + 649 + 0 + 2 + 6 = 666.

216649026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (216649021) and next prime (216649031).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216649021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 337666 + ... + 338306.

It is an arithmetic number, because the mean of its divisors is an integer number (8233650).

Almost surely, 2^216649026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216649026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263476800).

216649026 is an abundant number, since it is smaller than the sum of its proper divisors (310304574).

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

216649026 is a wasteful number, since it uses less digits than its factorization.

216649026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232 (or 1226 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 216649026 is about 14719.0022080303. The cubic root of 216649026 is about 600.6003491012.

The spelling of 216649026 in words is "two hundred sixteen million, six hundred forty-nine thousand, twenty-six".