647866944 has 112 divisors (see below), whose sum is σ = 1987539840. Its totient is φ = 206553600.

The previous prime is 647866943. The next prime is 647866951. The reversal of 647866944 is 449668746.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (647866943) 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, 31594 + ... + 47894.

Almost surely, 2^647866944 is an apocalyptic number.

647866944 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 647866944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993769920).

647866944 is an abundant number, since it is smaller than the sum of its proper divisors (1339672896).

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

647866944 is a wasteful number, since it uses less digits than its factorization.

647866944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16345 (or 16329 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 647866944 is about 25453.2305218807. The cubic root of 647866944 is about 865.2905097478.

The spelling of 647866944 in words is "six hundred forty-seven million, eight hundred sixty-six thousand, nine hundred forty-four".