647879 has 8 divisors (see below), whose sum is σ = 672000. Its totient is φ = 624312.

The previous prime is 647861. The next prime is 647891. The reversal of 647879 is 978746.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647879.

It is not an unprimeable number, because it can be changed into a prime (647809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4592 + ... + 4730.

It is an arithmetic number, because the mean of its divisors is an integer number (84000).

2⁶⁴⁷⁸⁷⁹ is an apocalyptic number.

647879 is a deficient number, since it is larger than the sum of its proper divisors (24121).

647879 is a wasteful number, since it uses less digits than its factorization.

647879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277.

The product of its digits is 84672, while the sum is 41.

The square root of 647879 is about 804.9093116619. The cubic root of 647879 is about 86.5295877042.

The spelling of 647879 in words is "six hundred forty-seven thousand, eight hundred seventy-nine".