647711677 has 4 divisors (see below), whose sum is σ = 665217436. Its totient is φ = 630205920.

The previous prime is 647711657. The next prime is 647711693. The reversal of 647711677 is 776117746.

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

It can be written as a sum of positive squares in 2 ways, for example, as 545175801 + 102535876 = 23349^2 + 10126^2 .

It is a cyclic number.

It is not a de Polignac number, because 647711677 - 2¹⁵ = 647678909 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 (647711627) 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, 8752824 + ... + 8752897.

It is an arithmetic number, because the mean of its divisors is an integer number (166304359).

Almost surely, 2^647711677 is an apocalyptic number.

It is an amenable number.

647711677 is a deficient number, since it is larger than the sum of its proper divisors (17505759).

647711677 is a wasteful number, since it uses less digits than its factorization.

647711677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17505758.

The product of its digits is 345744, while the sum is 46.

The square root of 647711677 is about 25450.1802940569. The cubic root of 647711677 is about 865.2213794029.

The spelling of 647711677 in words is "six hundred forty-seven million, seven hundred eleven thousand, six hundred seventy-seven".