671742681 has 8 divisors (see below), whose sum is σ = 895783584. Its totient is φ = 447765120.

The previous prime is 671742679. The next prime is 671742697. The reversal of 671742681 is 186247176.

671742681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 671742681 - 2¹ = 671742679 is a prime.

It is a super-2 number, since 2×671742681² = 902476458954135522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671742601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21466 + ... + 42476.

It is an arithmetic number, because the mean of its divisors is an integer number (111972948).

Almost surely, 2^671742681 is an apocalyptic number.

It is an amenable number.

671742681 is a deficient number, since it is larger than the sum of its proper divisors (224040903).

671742681 is a wasteful number, since it uses less digits than its factorization.

671742681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31671.

The product of its digits is 112896, while the sum is 42.

The square root of 671742681 is about 25917.9991704607. Note that the first 3 decimals coincide. The cubic root of 671742681 is about 875.7920147478.

The spelling of 671742681 in words is "six hundred seventy-one million, seven hundred forty-two thousand, six hundred eighty-one".