671726747 has 4 divisors (see below), whose sum is σ = 671780256. Its totient is φ = 671673240.

The previous prime is 671726711. The next prime is 671726777. The reversal of 671726747 is 747627176.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 671726747 - 2⁶ = 671726683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671726777) 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, 3422 + ... + 36812.

It is an arithmetic number, because the mean of its divisors is an integer number (167945064).

Almost surely, 2^671726747 is an apocalyptic number.

671726747 is a deficient number, since it is larger than the sum of its proper divisors (53509).

671726747 is a wasteful number, since it uses less digits than its factorization.

671726747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53508.

The product of its digits is 691488, while the sum is 47.

The square root of 671726747 is about 25917.6917760822. The cubic root of 671726747 is about 875.7850899830.

The spelling of 671726747 in words is "six hundred seventy-one million, seven hundred twenty-six thousand, seven hundred forty-seven".