647664276 has 48 divisors (see below), whose sum is σ = 1782824960. Its totient is φ = 179076960.

The previous prime is 647664271. The next prime is 647664319. The reversal of 647664276 is 672466746.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647664271) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 121756 + ... + 126963.

Almost surely, 2^647664276 is an apocalyptic number.

It is an amenable number.

647664276 is an abundant number, since it is smaller than the sum of its proper divisors (1135160684).

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

647664276 is a wasteful number, since it uses less digits than its factorization.

647664276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248764 (or 248762 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 48.

The square root of 647664276 is about 25449.2490262483. The cubic root of 647664276 is about 865.2002726046.

The spelling of 647664276 in words is "six hundred forty-seven million, six hundred sixty-four thousand, two hundred seventy-six".