671782438 has 16 divisors (see below), whose sum is σ = 1071661104. Its totient is φ = 314736640.

The previous prime is 671782403. The next prime is 671782457. The reversal of 671782438 is 834287176.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35803 + ... + 51238.

It is an arithmetic number, because the mean of its divisors is an integer number (66978819).

Almost surely, 2^671782438 is an apocalyptic number.

671782438 is a deficient number, since it is larger than the sum of its proper divisors (399878666).

671782438 is a wasteful number, since it uses less digits than its factorization.

671782438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87287.

The product of its digits is 451584, while the sum is 46.

The square root of 671782438 is about 25918.7661357558. The cubic root of 671782438 is about 875.8092922844.

It can be divided in two parts, 671782 and 438, that added together give a triangular number (672220 = T₁₁₅₉).

The spelling of 671782438 in words is "six hundred seventy-one million, seven hundred eighty-two thousand, four hundred thirty-eight".