647617893 has 16 divisors (see below), whose sum is σ = 932426880. Its totient is φ = 397456704.

The previous prime is 647617889. The next prime is 647617897. The reversal of 647617893 is 398716746.

It is an interprime number because it is at equal distance from previous prime (647617889) and next prime (647617897).

It is not a de Polignac number, because 647617893 - 2² = 647617889 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647617897) 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 15 ways as a sum of consecutive naturals, for example, 7713 + ... + 36806.

It is an arithmetic number, because the mean of its divisors is an integer number (58276680).

Almost surely, 2^647617893 is an apocalyptic number.

It is an amenable number.

647617893 is a deficient number, since it is larger than the sum of its proper divisors (284808987).

647617893 is a wasteful number, since it uses less digits than its factorization.

647617893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44908.

The product of its digits is 1524096, while the sum is 51.

The square root of 647617893 is about 25448.3377256747. The cubic root of 647617893 is about 865.1796181062.

The spelling of 647617893 in words is "six hundred forty-seven million, six hundred seventeen thousand, eight hundred ninety-three".