671688073820 has 24 divisors (see below), whose sum is σ = 1456046406528. Its totient is φ = 260008286400.

The previous prime is 671688073787. The next prime is 671688073841. The reversal of 671688073820 is 28370886176.

It is a happy number.

671688073820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541683311 + ... + 541684550.

It is an arithmetic number, because the mean of its divisors is an integer number (60668600272).

Almost surely, 2^671688073820 is an apocalyptic number.

It is an amenable number.

671688073820 is an abundant number, since it is smaller than the sum of its proper divisors (784358332708).

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

671688073820 is a wasteful number, since it uses less digits than its factorization.

671688073820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083367901 (or 1083367899 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 671688073820 in words is "six hundred seventy-one billion, six hundred eighty-eight million, seventy-three thousand, eight hundred twenty".