647642244 has 12 divisors (see below), whose sum is σ = 1511165264. Its totient is φ = 215880744.

The previous prime is 647642243. The next prime is 647642249. The reversal of 647642244 is 442246746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (647642243) 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, 26985082 + ... + 26985105.

Almost surely, 2^647642244 is an apocalyptic number.

It is an amenable number.

647642244 is an abundant number, since it is smaller than the sum of its proper divisors (863523020).

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

647642244 is a wasteful number, since it uses less digits than its factorization.

647642244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53970194 (or 53970192 counting only the distinct ones).

The product of its digits is 258048, while the sum is 39.

The square root of 647642244 is about 25448.8161610712. The cubic root of 647642244 is about 865.1904618075.

The spelling of 647642244 in words is "six hundred forty-seven million, six hundred forty-two thousand, two hundred forty-four".