647339520 has 160 divisors (see below), whose sum is σ = 2137006080. Its totient is φ = 166993920.

The previous prime is 647339471. The next prime is 647339533. The reversal of 647339520 is 25933746.

It is a tau number, because it is divible by the number of its divisors (160).

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, 236721 + ... + 239439.

It is an arithmetic number, because the mean of its divisors is an integer number (13356288).

Almost surely, 2^647339520 is an apocalyptic number.

647339520 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 647339520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1068503040).

647339520 is an abundant number, since it is smaller than the sum of its proper divisors (1489666560).

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

647339520 is a wasteful number, since it uses less digits than its factorization.

647339520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2776 (or 2760 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 39.

The square root of 647339520 is about 25442.8677628918. The cubic root of 647339520 is about 865.0556369929.

The spelling of 647339520 in words is "six hundred forty-seven million, three hundred thirty-nine thousand, five hundred twenty".