438791680 has 40 divisors (see below), whose sum is σ = 1052077752. Its totient is φ = 175515648.

The previous prime is 438791659. The next prime is 438791687. The reversal of 438791680 is 86197834.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 438791680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438791687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83142 + ... + 88261.

Almost surely, 2^438791680 is an apocalyptic number.

438791680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

438791680 is an abundant number, since it is smaller than the sum of its proper divisors (613286072).

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

438791680 is an equidigital number, since it uses as much as digits as its factorization.

438791680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171426 (or 171410 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 438791680 is about 20947.3549642908. The cubic root of 438791680 is about 759.8936139175.

The spelling of 438791680 in words is "four hundred thirty-eight million, seven hundred ninety-one thousand, six hundred eighty".