647211940 has 12 divisors (see below), whose sum is σ = 1359145116. Its totient is φ = 258884768.

The previous prime is 647211923. The next prime is 647211979. The reversal of 647211940 is 49112746.

647211940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 325153024 + 322058916 = 18032^2 + 17946^2 .

It is a junction number, because it is equal to n+sod(n) for n = 647211896 and 647211905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16180279 + ... + 16180318.

It is an arithmetic number, because the mean of its divisors is an integer number (113262093).

Almost surely, 2^647211940 is an apocalyptic number.

It is an amenable number.

647211940 is an abundant number, since it is smaller than the sum of its proper divisors (711933176).

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

647211940 is a wasteful number, since it uses less digits than its factorization.

647211940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32360606 (or 32360604 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 647211940 is about 25440.3604534213. The cubic root of 647211940 is about 864.9988038341.

The spelling of 647211940 in words is "six hundred forty-seven million, two hundred eleven thousand, nine hundred forty".