671975999 has 4 divisors (see below), whose sum is σ = 673446864. Its totient is φ = 670505136.

The previous prime is 671975989. The next prime is 671976001. The reversal of 671975999 is 999579176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 671975999 - 2⁸ = 671975743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671975929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734747 + ... + 735660.

It is an arithmetic number, because the mean of its divisors is an integer number (168361716).

Almost surely, 2^671975999 is an apocalyptic number.

671975999 is a deficient number, since it is larger than the sum of its proper divisors (1470865).

671975999 is a wasteful number, since it uses less digits than its factorization.

671975999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470864.

The product of its digits is 9644670, while the sum is 62.

The square root of 671975999 is about 25922.4998601601. The cubic root of 671975999 is about 875.8933999924.

The spelling of 671975999 in words is "six hundred seventy-one million, nine hundred seventy-five thousand, nine hundred ninety-nine".