671933844 has 18 divisors (see below), whose sum is σ = 1698499530. Its totient is φ = 223977936.

The previous prime is 671933837. The next prime is 671933851. The reversal of 671933844 is 448339176.

It is an interprime number because it is at equal distance from previous prime (671933837) and next prime (671933851).

It can be written as a sum of positive squares in only one way, i.e., 658538244 + 13395600 = 25662^2 + 3660^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 671933844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9332379 + ... + 9332450.

It is an arithmetic number, because the mean of its divisors is an integer number (94361085).

Almost surely, 2^671933844 is an apocalyptic number.

It is an amenable number.

671933844 is an abundant number, since it is smaller than the sum of its proper divisors (1026565686).

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

671933844 is a wasteful number, since it uses less digits than its factorization.

671933844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18664839 (or 18664834 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 671933844 is about 25921.6867506727. The cubic root of 671933844 is about 875.8750838331.

The spelling of 671933844 in words is "six hundred seventy-one million, nine hundred thirty-three thousand, eight hundred forty-four".