647016728531 has 8 divisors (see below), whose sum is σ = 660804349440. Its totient is φ = 633229995528.

The previous prime is 647016728521. The next prime is 647016728539. The reversal of 647016728531 is 135827610746.

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 647016728531 - 2³⁴ = 629836859347 is a prime.

It is a super-2 number, since 2×647016728531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647016728531.

It is not an unprimeable number, because it can be changed into a prime (647016728539) 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, 1371530 + ... + 1781888.

It is an arithmetic number, because the mean of its divisors is an integer number (82600543680).

Almost surely, 2^647016728531 is an apocalyptic number.

647016728531 is a deficient number, since it is larger than the sum of its proper divisors (13787620909).

647016728531 is a wasteful number, since it uses less digits than its factorization.

647016728531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443953.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 647016728531 in words is "six hundred forty-seven billion, sixteen million, seven hundred twenty-eight thousand, five hundred thirty-one".