671491128 has 64 divisors (see below), whose sum is σ = 2092965120. Its totient is φ = 174412800.

The previous prime is 671491097. The next prime is 671491159. The reversal of 671491128 is 821194176.

It is an interprime number because it is at equal distance from previous prime (671491097) and next prime (671491159).

It is a super-4 number, since 4×671491128⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179833 + ... + 183528.

It is an arithmetic number, because the mean of its divisors is an integer number (32702580).

Almost surely, 2^671491128 is an apocalyptic number.

It is an amenable number.

671491128 is an abundant number, since it is smaller than the sum of its proper divisors (1421473992).

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

671491128 is a wasteful number, since it uses less digits than its factorization.

671491128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363388 (or 363384 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 671491128 is about 25913.1458530222. The cubic root of 671491128 is about 875.6826794220.

The spelling of 671491128 in words is "six hundred seventy-one million, four hundred ninety-one thousand, one hundred twenty-eight".