216231520 has 96 divisors (see below), whose sum is σ = 533488032. Its totient is φ = 82747392.

The previous prime is 216231503. The next prime is 216231539. The reversal of 216231520 is 25132612.

216231520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 216231491 and 216231500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364344 + ... + 364936.

It is an arithmetic number, because the mean of its divisors is an integer number (5557167).

Almost surely, 2^216231520 is an apocalyptic number.

216231520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216231520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266744016).

216231520 is an abundant number, since it is smaller than the sum of its proper divisors (317256512).

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

216231520 is a wasteful number, since it uses less digits than its factorization.

216231520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 216231520 is about 14704.8128175778. The cubic root of 216231520 is about 600.2142938249.

The spelling of 216231520 in words is "two hundred sixteen million, two hundred thirty-one thousand, five hundred twenty".