647640446 has 16 divisors (see below), whose sum is σ = 979440000. Its totient is φ = 321171480.

The previous prime is 647640431. The next prime is 647640481. The reversal of 647640446 is 644046746.

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 7 ways as a sum of consecutive naturals, for example, 127055 + ... + 132053.

It is an arithmetic number, because the mean of its divisors is an integer number (61215000).

Almost surely, 2^647640446 is an apocalyptic number.

647640446 is a deficient number, since it is larger than the sum of its proper divisors (331799554).

647640446 is a wasteful number, since it uses less digits than its factorization.

647640446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5519.

The product of its (nonzero) digits is 387072, while the sum is 41.

The square root of 647640446 is about 25448.7808352385. The cubic root of 647640446 is about 865.1896611525.

The spelling of 647640446 in words is "six hundred forty-seven million, six hundred forty thousand, four hundred forty-six".