647449662220 has 24 divisors (see below), whose sum is σ = 1376025550704. Its totient is φ = 255859624896.

The previous prime is 647449662193. The next prime is 647449662271. The reversal of 647449662220 is 22266944746.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195013299 + ... + 195016618.

It is an arithmetic number, because the mean of its divisors is an integer number (57334397946).

Almost surely, 2^647449662220 is an apocalyptic number.

It is an amenable number.

647449662220 is an abundant number, since it is smaller than the sum of its proper divisors (728575888484).

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

647449662220 is a wasteful number, since it uses less digits than its factorization.

647449662220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390030009 (or 390030007 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 52.

The spelling of 647449662220 in words is "six hundred forty-seven billion, four hundred forty-nine million, six hundred sixty-two thousand, two hundred twenty".