216513288 has 24 divisors (see below), whose sum is σ = 586390350. Its totient is φ = 72171072.

The previous prime is 216513287. The next prime is 216513359. The reversal of 216513288 is 882315612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 178543044 + 37970244 = 13362^2 + 6162^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is not an unprimeable number, because it can be changed into a prime (216513287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1503493 + ... + 1503636.

Almost surely, 2^216513288 is an apocalyptic number.

It is an amenable number.

216513288 is an abundant number, since it is smaller than the sum of its proper divisors (369877062).

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

216513288 is a wasteful number, since it uses less digits than its factorization.

216513288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007141 (or 3007134 counting only the distinct ones).

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

The square root of 216513288 is about 14714.3905072551. The cubic root of 216513288 is about 600.4748906989.

The spelling of 216513288 in words is "two hundred sixteen million, five hundred thirteen thousand, two hundred eighty-eight".