647679597 has 4 divisors (see below), whose sum is σ = 863572800. Its totient is φ = 431786396.

The previous prime is 647679577. The next prime is 647679601. The reversal of 647679597 is 795976746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647679597 - 2¹⁰ = 647678573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647679597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647679577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107946597 + ... + 107946602.

It is an arithmetic number, because the mean of its divisors is an integer number (215893200).

Almost surely, 2^647679597 is an apocalyptic number.

It is an amenable number.

647679597 is a deficient number, since it is larger than the sum of its proper divisors (215893203).

647679597 is a wasteful number, since it uses less digits than its factorization.

647679597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215893202.

The product of its digits is 20003760, while the sum is 60.

The square root of 647679597 is about 25449.5500353150. The cubic root of 647679597 is about 865.2070948783.

The spelling of 647679597 in words is "six hundred forty-seven million, six hundred seventy-nine thousand, five hundred ninety-seven".