647616986 has 16 divisors (see below), whose sum is σ = 988910208. Its totient is φ = 318015600.

The previous prime is 647616979. The next prime is 647616997. The reversal of 647616986 is 689616746.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 28676 + ... + 46016.

It is an arithmetic number, because the mean of its divisors is an integer number (61806888).

Almost surely, 2^647616986 is an apocalyptic number.

647616986 is a deficient number, since it is larger than the sum of its proper divisors (341293222).

647616986 is a wasteful number, since it uses less digits than its factorization.

647616986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17677.

The product of its digits is 2612736, while the sum is 53.

The square root of 647616986 is about 25448.3199052511. The cubic root of 647616986 is about 865.1792142064.

The spelling of 647616986 in words is "six hundred forty-seven million, six hundred sixteen thousand, nine hundred eighty-six".