216248388 has 12 divisors (see below), whose sum is σ = 504579600. Its totient is φ = 72082792.

The previous prime is 216248377. The next prime is 216248407. The reversal of 216248388 is 883842612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9010338 + ... + 9010361.

It is an arithmetic number, because the mean of its divisors is an integer number (42048300).

Almost surely, 2^216248388 is an apocalyptic number.

It is an amenable number.

216248388 is an abundant number, since it is smaller than the sum of its proper divisors (288331212).

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

216248388 is a wasteful number, since it uses less digits than its factorization.

216248388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18020706 (or 18020704 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 216248388 is about 14705.3863601063. The cubic root of 216248388 is about 600.2299007870.

The spelling of 216248388 in words is "two hundred sixteen million, two hundred forty-eight thousand, three hundred eighty-eight".