647783268 has 48 divisors (see below), whose sum is σ = 1672151040. Its totient is φ = 193530400.

The previous prime is 647783251. The next prime is 647783287. The reversal of 647783268 is 862387746.

It is a self number, because there is not a number n which added to its sum of digits gives 647783268.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25188 + ... + 43931.

It is an arithmetic number, because the mean of its divisors is an integer number (34836480).

Almost surely, 2^647783268 is an apocalyptic number.

It is an amenable number.

647783268 is an abundant number, since it is smaller than the sum of its proper divisors (1024367772).

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

647783268 is a wasteful number, since it uses less digits than its factorization.

647783268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69208 (or 69206 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 51.

The square root of 647783268 is about 25451.5867481774. The cubic root of 647783268 is about 865.2532556137.

The spelling of 647783268 in words is "six hundred forty-seven million, seven hundred eighty-three thousand, two hundred sixty-eight".