647717057 has 8 divisors (see below), whose sum is σ = 714555240. Its totient is φ = 583309440.

The previous prime is 647717047. The next prime is 647717089. The reversal of 647717057 is 750717746.

It can be written as a sum of positive squares in 4 ways, for example, as 77510416 + 570206641 = 8804^2 + 23879^2 .

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 647717057 - 2⁸ = 647716801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647716999 and 647717017.

It is not an unprimeable number, because it can be changed into a prime (647717047) 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, 607082 + ... + 608147.

It is an arithmetic number, because the mean of its divisors is an integer number (89319405).

Almost surely, 2^647717057 is an apocalyptic number.

It is an amenable number.

647717057 is a deficient number, since it is larger than the sum of its proper divisors (66838183).

647717057 is a wasteful number, since it uses less digits than its factorization.

647717057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215283.

The product of its (nonzero) digits is 288120, while the sum is 44.

The square root of 647717057 is about 25450.2859905346. The cubic root of 647717057 is about 865.2237749534.

The spelling of 647717057 in words is "six hundred forty-seven million, seven hundred seventeen thousand, fifty-seven".