671987874 has 16 divisors (see below), whose sum is σ = 1344232512. Its totient is φ = 223953168.

The previous prime is 671987857. The next prime is 671987891. The reversal of 671987874 is 478789176.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (671987857) and next prime (671987891).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48667 + ... + 60929.

It is an arithmetic number, because the mean of its divisors is an integer number (84014532).

Almost surely, 2^671987874 is an apocalyptic number.

671987874 is an abundant number, since it is smaller than the sum of its proper divisors (672244638).

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

671987874 is a wasteful number, since it uses less digits than its factorization.

671987874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21401.

The product of its digits is 4741632, while the sum is 57.

The square root of 671987874 is about 25922.7289072736. The cubic root of 671987874 is about 875.8985594886.

The spelling of 671987874 in words is "six hundred seventy-one million, nine hundred eighty-seven thousand, eight hundred seventy-four".