647079 has 4 divisors (see below), whose sum is σ = 862776. Its totient is φ = 431384.

The previous prime is 647069. The next prime is 647081. The reversal of 647079 is 970746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 647079 - 2⁵ = 647047 is a prime.

It is a super-2 number, since 2×647079² = 837422464482, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107844 + ... + 107849.

It is an arithmetic number, because the mean of its divisors is an integer number (215694).

2⁶⁴⁷⁰⁷⁹ is an apocalyptic number.

647079 is a deficient number, since it is larger than the sum of its proper divisors (215697).

647079 is a wasteful number, since it uses less digits than its factorization.

647079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215696.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 647079 is about 804.4122077642. The cubic root of 647079 is about 86.4939575005.

The spelling of 647079 in words is "six hundred forty-seven thousand, seventy-nine".