217996950 has 96 divisors (see below), whose sum is σ = 583596576. Its totient is φ = 53647360.

The previous prime is 217996949. The next prime is 217996979. The reversal of 217996950 is 59699712.

It is a self number, because there is not a number n which added to its sum of digits gives 217996950.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134344 + ... + 135956.

It is an arithmetic number, because the mean of its divisors is an integer number (6079131).

Almost surely, 2^217996950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217996950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291798288).

217996950 is an abundant number, since it is smaller than the sum of its proper divisors (365599626).

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

217996950 is a wasteful number, since it uses less digits than its factorization.

217996950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698 (or 1693 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 48.

The square root of 217996950 is about 14764.7197738393. The cubic root of 217996950 is about 601.8433586926.

The spelling of 217996950 in words is "two hundred seventeen million, nine hundred ninety-six thousand, nine hundred fifty".