671926987 has 18 divisors (see below), whose sum is σ = 709998828. Its totient is φ = 635547528.

The previous prime is 671926961. The next prime is 671927027. The reversal of 671926987 is 789629176.

It is not a de Polignac number, because 671926987 - 2²⁷ = 537709259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671926687) 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 17 ways as a sum of consecutive naturals, for example, 10028728 + ... + 10028794.

Almost surely, 2^671926987 is an apocalyptic number.

671926987 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

671926987 is a deficient number, since it is larger than the sum of its proper divisors (38071841).

671926987 is an frugal number, since it uses more digits than its factorization.

671926987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295 (or 169 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 55.

The square root of 671926987 is about 25921.5544865658. The cubic root of 671926987 is about 875.8721044248.

The spelling of 671926987 in words is "six hundred seventy-one million, nine hundred twenty-six thousand, nine hundred eighty-seven".