216531828 has 36 divisors (see below), whose sum is σ = 576153760. Its totient is φ = 68378256.

The previous prime is 216531823. The next prime is 216531841. The reversal of 216531828 is 828135612.

It is a happy number.

216531828 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 216531792 and 216531801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216531823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157600 + ... + 158967.

Almost surely, 2^216531828 is an apocalyptic number.

It is an amenable number.

216531828 is an abundant number, since it is smaller than the sum of its proper divisors (359621932).

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

216531828 is a wasteful number, since it uses less digits than its factorization.

216531828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316596 (or 316591 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 216531828 is about 14715.0204892824. The cubic root of 216531828 is about 600.4920297343.

The spelling of 216531828 in words is "two hundred sixteen million, five hundred thirty-one thousand, eight hundred twenty-eight".