671946989 has 24 divisors (see below), whose sum is σ = 816742080. Its totient is φ = 541432512.

The previous prime is 671946983. The next prime is 671946997. The reversal of 671946989 is 989649176.

It is not a de Polignac number, because 671946989 - 2²⁴ = 655169773 is a prime.

It is a super-2 number, since 2×671946989² = 903025512052332242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671946983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 350297 + ... + 352209.

It is an arithmetic number, because the mean of its divisors is an integer number (34030920).

Almost surely, 2^671946989 is an apocalyptic number.

It is an amenable number.

671946989 is a deficient number, since it is larger than the sum of its proper divisors (144795091).

671946989 is a wasteful number, since it uses less digits than its factorization.

671946989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097 (or 2078 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 59.

The square root of 671946989 is about 25921.9403016055. The cubic root of 671946989 is about 875.8807953591.

The spelling of 671946989 in words is "six hundred seventy-one million, nine hundred forty-six thousand, nine hundred eighty-nine".