647369985 has 32 divisors (see below), whose sum is σ = 1049731200. Its totient is φ = 340651008.

The previous prime is 647369971. The next prime is 647369999. The reversal of 647369985 is 589963746.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (647369971) and next prime (647369999).

It is not a de Polignac number, because 647369985 - 2⁴ = 647369969 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 363417 + ... + 365193.

It is an arithmetic number, because the mean of its divisors is an integer number (32804100).

Almost surely, 2^647369985 is an apocalyptic number.

It is an amenable number.

647369985 is a deficient number, since it is larger than the sum of its proper divisors (402361215).

647369985 is a wasteful number, since it uses less digits than its factorization.

647369985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097.

The product of its digits is 9797760, while the sum is 57.

The square root of 647369985 is about 25443.4664501518. The cubic root of 647369985 is about 865.0692071550.

The spelling of 647369985 in words is "six hundred forty-seven million, three hundred sixty-nine thousand, nine hundred eighty-five".