671739761880 has 768 divisors, whose sum is σ = 2638850659200. Its totient is φ = 153225768960.

The previous prime is 671739761821. The next prime is 671739761899. The reversal of 671739761880 is 88167937176.

671739761880 is a `hidden beast` number, since 6 + 7 + 1 + 7 + 3 + 9 + 7 + 618 + 8 + 0 = 666.

It is a super-2 number, since 2×671739761880² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 179944494 + ... + 179948226.

Almost surely, 2^671739761880 is an apocalyptic number.

671739761880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671739761880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1319425329600).

671739761880 is an abundant number, since it is smaller than the sum of its proper divisors (1967110897320).

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

671739761880 is a wasteful number, since it uses less digits than its factorization.

671739761880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804 (or 3771 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 63.

The spelling of 671739761880 in words is "six hundred seventy-one billion, seven hundred thirty-nine million, seven hundred sixty-one thousand, eight hundred eighty".