216690448 has 60 divisors (see below), whose sum is σ = 458923008. Its totient is φ = 99066240.

The previous prime is 216690433. The next prime is 216690457. The reversal of 216690448 is 844096612.

216690448 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 216690448.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 343093 + ... + 343723.

Almost surely, 2^216690448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216690448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229461504).

216690448 is an abundant number, since it is smaller than the sum of its proper divisors (242232560).

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

216690448 is a wasteful number, since it uses less digits than its factorization.

216690448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 773 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 216690448 is about 14720.4092334418. The cubic root of 216690448 is about 600.6386237288.

The spelling of 216690448 in words is "two hundred sixteen million, six hundred ninety thousand, four hundred forty-eight".