647021044 has 12 divisors (see below), whose sum is σ = 1132475904. Its totient is φ = 323456504.

The previous prime is 647021009. The next prime is 647021047. The reversal of 647021044 is 440120746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647021047) 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 3 ways as a sum of consecutive naturals, for example, 26829 + ... + 44875.

It is an arithmetic number, because the mean of its divisors is an integer number (94372992).

Almost surely, 2^647021044 is an apocalyptic number.

It is an amenable number.

647021044 is a deficient number, since it is larger than the sum of its proper divisors (485454860).

647021044 is a wasteful number, since it uses less digits than its factorization.

647021044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27014 (or 27012 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 647021044 is about 25436.6083430948. The cubic root of 647021044 is about 864.9137512989.

The spelling of 647021044 in words is "six hundred forty-seven million, twenty-one thousand, forty-four".