647660280 has 64 divisors (see below), whose sum is σ = 1952265600. Its totient is φ = 171884160.

The previous prime is 647660269. The next prime is 647660317. The reversal of 647660280 is 82066746.

It is a congruent number.

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, 12531 + ... + 38109.

It is an arithmetic number, because the mean of its divisors is an integer number (30504150).

Almost surely, 2^647660280 is an apocalyptic number.

647660280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647660280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976132800).

647660280 is an abundant number, since it is smaller than the sum of its proper divisors (1304605320).

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

647660280 is a wasteful number, since it uses less digits than its factorization.

647660280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25804 (or 25800 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 647660280 is about 25449.1705169343. The cubic root of 647660280 is about 865.1984932119.

The spelling of 647660280 in words is "six hundred forty-seven million, six hundred sixty thousand, two hundred eighty".