671689812 has 24 divisors (see below), whose sum is σ = 1571726016. Its totient is φ = 223260928.

The previous prime is 671689783. The next prime is 671689813. The reversal of 671689812 is 218986176.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671689813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75048 + ... + 83519.

It is an arithmetic number, because the mean of its divisors is an integer number (65488584).

Almost surely, 2^671689812 is an apocalyptic number.

It is an amenable number.

671689812 is an abundant number, since it is smaller than the sum of its proper divisors (900036204).

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

671689812 is a wasteful number, since it uses less digits than its factorization.

671689812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158927 (or 158925 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 671689812 is about 25916.9792221239. The cubic root of 671689812 is about 875.7690379621.

The spelling of 671689812 in words is "six hundred seventy-one million, six hundred eighty-nine thousand, eight hundred twelve".