216723744 has 36 divisors (see below), whose sum is σ = 616308966. Its totient is φ = 72241152.

The previous prime is 216723743. The next prime is 216723751. The reversal of 216723744 is 447327612.

216723744 is a `hidden beast` number, since 216 + 72 + 374 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 130233744 + 86490000 = 11412^2 + 9300^2 .

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 = 216723699 and 216723708.

It is not an unprimeable number, because it can be changed into a prime (216723743) 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 5 ways as a sum of consecutive naturals, for example, 375969 + ... + 376544.

Almost surely, 2^216723744 is an apocalyptic number.

216723744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216723744 is an abundant number, since it is smaller than the sum of its proper divisors (399585222).

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

216723744 is a wasteful number, since it uses less digits than its factorization.

216723744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752529 (or 752518 counting only the distinct ones).

The product of its digits is 56448, while the sum is 36.

The square root of 216723744 is about 14721.5401368199. The cubic root of 216723744 is about 600.6693862590.

The spelling of 216723744 in words is "two hundred sixteen million, seven hundred twenty-three thousand, seven hundred forty-four".