647640330 has 48 divisors (see below), whose sum is σ = 1651168800. Its totient is φ = 162542848.

The previous prime is 647640319. The next prime is 647640349. The reversal of 647640330 is 33046746.

It is a junction number, because it is equal to n+sod(n) for n = 647640291 and 647640300.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 28680 + ... + 46019.

It is an arithmetic number, because the mean of its divisors is an integer number (34399350).

Almost surely, 2^647640330 is an apocalyptic number.

647640330 is an abundant number, since it is smaller than the sum of its proper divisors (1003528470).

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

647640330 is a wasteful number, since it uses less digits than its factorization.

647640330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74743 (or 74726 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 33.

The square root of 647640330 is about 25448.7785561508. The cubic root of 647640330 is about 865.1896094973.

The spelling of 647640330 in words is "six hundred forty-seven million, six hundred forty thousand, three hundred thirty".