647378985 has 32 divisors (see below), whose sum is σ = 1133626752. Its totient is φ = 312865280.

The previous prime is 647378959. The next prime is 647379037. The reversal of 647378985 is 589873746.

It is not a de Polignac number, because 647378985 - 2²⁵ = 613824553 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46117 + ... + 58493.

It is an arithmetic number, because the mean of its divisors is an integer number (35425836).

Almost surely, 2^647378985 is an apocalyptic number.

It is an amenable number.

647378985 is a deficient number, since it is larger than the sum of its proper divisors (486247767).

647378985 is a wasteful number, since it uses less digits than its factorization.

647378985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12713.

The product of its digits is 10160640, while the sum is 57.

The square root of 647378985 is about 25443.6433122303. The cubic root of 647378985 is about 865.0732159840.

It can be divided in two parts, 6473 and 78985, that added together give a palindrome (85458).

The spelling of 647378985 in words is "six hundred forty-seven million, three hundred seventy-eight thousand, nine hundred eighty-five".