647617379 has 4 divisors (see below), whose sum is σ = 647668560. Its totient is φ = 647566200.

The previous prime is 647617361. The next prime is 647617403. The reversal of 647617379 is 973716746.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647617379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647617979) 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, 8762 + ... + 37040.

It is an arithmetic number, because the mean of its divisors is an integer number (161917140).

Almost surely, 2^647617379 is an apocalyptic number.

647617379 is a deficient number, since it is larger than the sum of its proper divisors (51181).

647617379 is a wasteful number, since it uses less digits than its factorization.

647617379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51180.

The product of its digits is 1333584, while the sum is 50.

The square root of 647617379 is about 25448.3276267813. The cubic root of 647617379 is about 865.1793892149.

The spelling of 647617379 in words is "six hundred forty-seven million, six hundred seventeen thousand, three hundred seventy-nine".