647555532 has 48 divisors (see below), whose sum is σ = 1639663872. Its totient is φ = 197720640.

The previous prime is 647555509. The next prime is 647555543. The reversal of 647555532 is 235555746.

647555532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×647555532⁴ (a number of 36 digits) contains 4444 as substring.

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, 4593 + ... + 36279.

It is an arithmetic number, because the mean of its divisors is an integer number (34159664).

Almost surely, 2^647555532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647555532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819831936).

647555532 is an abundant number, since it is smaller than the sum of its proper divisors (992108340).

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

647555532 is a wasteful number, since it uses less digits than its factorization.

647555532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31838 (or 31836 counting only the distinct ones).

The product of its digits is 630000, while the sum is 42.

The square root of 647555532 is about 25447.1124491562. The cubic root of 647555532 is about 865.1518469989.

The spelling of 647555532 in words is "six hundred forty-seven million, five hundred fifty-five thousand, five hundred thirty-two".