671782312404 has 144 divisors (see below), whose sum is σ = 2055703104000. Its totient is φ = 180573539328.

The previous prime is 671782312391. The next prime is 671782312423. The reversal of 671782312404 is 404213287176.

671782312404 is a `hidden beast` number, since 6 + 7 + 1 + 7 + 8 + 231 + 2 + 404 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 671782312404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10889157 + ... + 10950675.

It is an arithmetic number, because the mean of its divisors is an integer number (14275716000).

Almost surely, 2^671782312404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671782312404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027851552000).

671782312404 is an abundant number, since it is smaller than the sum of its proper divisors (1383920791596).

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

671782312404 is a wasteful number, since it uses less digits than its factorization.

671782312404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64102 (or 64097 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 671782312404 in words is "six hundred seventy-one billion, seven hundred eighty-two million, three hundred twelve thousand, four hundred four".