647564643860 has 48 divisors (see below), whose sum is σ = 1404453775872. Its totient is φ = 250545052800.

The previous prime is 647564643853. The next prime is 647564643899. The reversal of 647564643860 is 68346465746.

It is a super-3 number, since 3×647564643860³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647564643860.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 987134 + ... + 1506506.

It is an arithmetic number, because the mean of its divisors is an integer number (29259453664).

Almost surely, 2^647564643860 is an apocalyptic number.

It is an amenable number.

647564643860 is an abundant number, since it is smaller than the sum of its proper divisors (756889132012).

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

647564643860 is a wasteful number, since it uses less digits than its factorization.

647564643860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521424 (or 521422 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 59.

The spelling of 647564643860 in words is "six hundred forty-seven billion, five hundred sixty-four million, six hundred forty-three thousand, eight hundred sixty".