671389928 has 64 divisors (see below), whose sum is σ = 1451736000. Its totient is φ = 287884800.

The previous prime is 671389921. The next prime is 671389937. The reversal of 671389928 is 829983176.

It is a self number, because there is not a number n which added to its sum of digits gives 671389928.

It is not an unprimeable number, because it can be changed into a prime (671389921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469118 + ... + 470546.

It is an arithmetic number, because the mean of its divisors is an integer number (22683375).

Almost surely, 2^671389928 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 671389928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (725868000).

671389928 is an abundant number, since it is smaller than the sum of its proper divisors (780346072).

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

671389928 is a wasteful number, since it uses less digits than its factorization.

671389928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746 (or 1742 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 53.

The square root of 671389928 is about 25911.1931025956. The cubic root of 671389928 is about 875.6386860190.

The spelling of 671389928 in words is "six hundred seventy-one million, three hundred eighty-nine thousand, nine hundred twenty-eight".