647689677 has 8 divisors (see below), whose sum is σ = 864143616. Its totient is φ = 431514432.

The previous prime is 647689673. The next prime is 647689697. The reversal of 647689677 is 776986746.

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

It is not a de Polignac number, because 647689677 - 2² = 647689673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647689677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647689673) 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, 64188 + ... + 73589.

It is an arithmetic number, because the mean of its divisors is an integer number (108017952).

Almost surely, 2^647689677 is an apocalyptic number.

It is an amenable number.

647689677 is a deficient number, since it is larger than the sum of its proper divisors (216453939).

647689677 is a wasteful number, since it uses less digits than its factorization.

647689677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139347.

The product of its digits is 21337344, while the sum is 60.

The square root of 647689677 is about 25449.7480734093. The cubic root of 647689677 is about 865.2115833334.

The spelling of 647689677 in words is "six hundred forty-seven million, six hundred eighty-nine thousand, six hundred seventy-seven".