671801687 has 8 divisors (see below), whose sum is σ = 718109280. Its totient is φ = 626919040.

The previous prime is 671801681. The next prime is 671801693. The reversal of 671801687 is 786108176.

It is an interprime number because it is at equal distance from previous prime (671801681) and next prime (671801693).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 671801687 - 2⁶ = 671801623 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 (671801681) 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 7 ways as a sum of consecutive naturals, for example, 355262 + ... + 357147.

It is an arithmetic number, because the mean of its divisors is an integer number (89763660).

Almost surely, 2^671801687 is an apocalyptic number.

671801687 is a deficient number, since it is larger than the sum of its proper divisors (46307593).

671801687 is a wasteful number, since it uses less digits than its factorization.

671801687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712473.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 671801687 is about 25919.1374663587. The cubic root of 671801687 is about 875.8176572406.

The spelling of 671801687 in words is "six hundred seventy-one million, eight hundred one thousand, six hundred eighty-seven".