216312544 has 48 divisors (see below), whose sum is σ = 502419456. Its totient is φ = 89712000.

The previous prime is 216312541. The next prime is 216312581. The reversal of 216312544 is 445213612.

It is a super-2 number, since 2×216312544² = 93582233383503872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216312541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8632 + ... + 22519.

It is an arithmetic number, because the mean of its divisors is an integer number (10467072).

Almost surely, 2^216312544 is an apocalyptic number.

It is an amenable number.

216312544 is an abundant number, since it is smaller than the sum of its proper divisors (286106912).

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

216312544 is a wasteful number, since it uses less digits than its factorization.

216312544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31199 (or 31191 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 216312544 is about 14707.5675759114. The cubic root of 216312544 is about 600.2892531246.

The spelling of 216312544 in words is "two hundred sixteen million, three hundred twelve thousand, five hundred forty-four".