647642996 has 96 divisors (see below), whose sum is σ = 1553260800. Its totient is φ = 232848000.

The previous prime is 647642981. The next prime is 647643013. The reversal of 647642996 is 699246746.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 194546 + ... + 197846.

It is an arithmetic number, because the mean of its divisors is an integer number (16179800).

Almost surely, 2^647642996 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 647642996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776630400).

647642996 is an abundant number, since it is smaller than the sum of its proper divisors (905617804).

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

647642996 is a wasteful number, since it uses less digits than its factorization.

647642996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3350 (or 3334 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 53.

The square root of 647642996 is about 25448.8309358210. The cubic root of 647642996 is about 865.1907966749.

The spelling of 647642996 in words is "six hundred forty-seven million, six hundred forty-two thousand, nine hundred ninety-six".