438781708836 has 81 divisors (see below), whose sum is σ = 1120191497971. Its totient is φ = 144817849344.

The previous prime is 438781708697. The next prime is 438781708853. The reversal of 438781708836 is 638807187834.

The square root of 438781708836 is 662406.

It is a perfect power (a square), and thus also a powerful number.

438781708836 is a `hidden beast` number, since 4 + 387 + 8 + 170 + 8 + 83 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6659539236 + 432122169600 = 81606^2 + 657360^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 449110780 + ... + 449111756.

Almost surely, 2^438781708836 is an apocalyptic number.

438781708836 is the 662406-th square number.

It is an amenable number.

438781708836 is an abundant number, since it is smaller than the sum of its proper divisors (681409789135).

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

438781708836 is an equidigital number, since it uses as much as digits as its factorization.

438781708836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 63.

The spelling of 438781708836 in words is "four hundred thirty-eight billion, seven hundred eighty-one million, seven hundred eight thousand, eight hundred thirty-six".