216439552 has 72 divisors (see below), whose sum is σ = 496692000. Its totient is φ = 92209152.

The previous prime is 216439549. The next prime is 216439567. The reversal of 216439552 is 255934612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481824 + ... + 482272.

It is an arithmetic number, because the mean of its divisors is an integer number (6898500).

Almost surely, 2^216439552 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 216439552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248346000).

216439552 is an abundant number, since it is smaller than the sum of its proper divisors (280252448).

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

216439552 is an equidigital number, since it uses as much as digits as its factorization.

216439552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 727 counting only the distinct ones).

The product of its digits is 64800, while the sum is 37.

The square root of 216439552 is about 14711.8847195048. The cubic root of 216439552 is about 600.4067168327.

The spelling of 216439552 in words is "two hundred sixteen million, four hundred thirty-nine thousand, five hundred fifty-two".