647896644840 has 64 divisors (see below), whose sum is σ = 1944279941760. Its totient is φ = 172719993600.

The previous prime is 647896644827. The next prime is 647896644877. The reversal of 647896644840 is 48446698746.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421684 + ... + 1213923.

It is an arithmetic number, because the mean of its divisors is an integer number (30379374090).

Almost surely, 2^647896644840 is an apocalyptic number.

647896644840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647896644840 is an abundant number, since it is smaller than the sum of its proper divisors (1296383296920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647896644840 is a wasteful number, since it uses less digits than its factorization.

647896644840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638922 (or 1638918 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 66.

The spelling of 647896644840 in words is "six hundred forty-seven billion, eight hundred ninety-six million, six hundred forty-four thousand, eight hundred forty".