671983940 has 24 divisors (see below), whose sum is σ = 1459828440. Its totient is φ = 259524608.

The previous prime is 671983913. The next prime is 671983967. The reversal of 671983940 is 49389176.

It is an interprime number because it is at equal distance from previous prime (671983913) and next prime (671983967).

It can be written as a sum of positive squares in 4 ways, for example, as 237344836 + 434639104 = 15406^2 + 20848^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578717 + ... + 579876.

It is an arithmetic number, because the mean of its divisors is an integer number (60826185).

Almost surely, 2^671983940 is an apocalyptic number.

It is an amenable number.

671983940 is an abundant number, since it is smaller than the sum of its proper divisors (787844500).

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

671983940 is a wasteful number, since it uses less digits than its factorization.

671983940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158631 (or 1158629 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 671983940 is about 25922.6530278056. The cubic root of 671983940 is about 875.8968502357.

The spelling of 671983940 in words is "six hundred seventy-one million, nine hundred eighty-three thousand, nine hundred forty".