647996532 has 48 divisors (see below), whose sum is σ = 1572480000. Its totient is φ = 207437440.

The previous prime is 647996519. The next prime is 647996537. The reversal of 647996532 is 235699746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647996537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61594 + ... + 71342.

It is an arithmetic number, because the mean of its divisors is an integer number (32760000).

Almost surely, 2^647996532 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 647996532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786240000).

647996532 is an abundant number, since it is smaller than the sum of its proper divisors (924483468).

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

647996532 is a wasteful number, since it uses less digits than its factorization.

647996532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9976 (or 9974 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 51.

The square root of 647996532 is about 25455.7760046713. The cubic root of 647996532 is about 865.3481984405.

The spelling of 647996532 in words is "six hundred forty-seven million, nine hundred ninety-six thousand, five hundred thirty-two".