647650944 has 128 divisors (see below), whose sum is σ = 1940692800. Its totient is φ = 212585472.

The previous prime is 647650943. The next prime is 647650961. The reversal of 647650944 is 449056746.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×647650944² = 838903490528182272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647650944.

It is not an unprimeable number, because it can be changed into a prime (647650943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230154 + ... + 232950.

Almost surely, 2^647650944 is an apocalyptic number.

647650944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647650944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (970346400).

647650944 is an abundant number, since it is smaller than the sum of its proper divisors (1293041856).

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

647650944 is a wasteful number, since it uses less digits than its factorization.

647650944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887 (or 2869 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 647650944 is about 25448.9870918274. The cubic root of 647650944 is about 865.1943359233.

The spelling of 647650944 in words is "six hundred forty-seven million, six hundred fifty thousand, nine hundred forty-four".