647729792639 has 8 divisors (see below), whose sum is σ = 670074930000. Its totient is φ = 625385297152.

The previous prime is 647729792587. The next prime is 647729792701. The reversal of 647729792639 is 936297927746.

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 647729792639 - 2²⁸ = 647461357183 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 (647729792239) 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, 2850287 + ... + 3069135.

It is an arithmetic number, because the mean of its divisors is an integer number (83759366250).

Almost surely, 2^647729792639 is an apocalyptic number.

647729792639 is a deficient number, since it is larger than the sum of its proper divisors (22345137361).

647729792639 is a wasteful number, since it uses less digits than its factorization.

647729792639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320937.

The product of its digits is 432081216, while the sum is 71.

The spelling of 647729792639 in words is "six hundred forty-seven billion, seven hundred twenty-nine million, seven hundred ninety-two thousand, six hundred thirty-nine".