647611680 has 96 divisors (see below), whose sum is σ = 2043595008. Its totient is φ = 172390400.

The previous prime is 647611639. The next prime is 647611709. The reversal of 647611680 is 86116746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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, 436540 + ... + 438020.

It is an arithmetic number, because the mean of its divisors is an integer number (21287448).

Almost surely, 2^647611680 is an apocalyptic number.

647611680 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 647611680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021797504).

647611680 is an abundant number, since it is smaller than the sum of its proper divisors (1395983328).

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

647611680 is a wasteful number, since it uses less digits than its factorization.

647611680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410 (or 2402 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 647611680 is about 25448.2156545405. The cubic root of 647611680 is about 865.1768513625.

The spelling of 647611680 in words is "six hundred forty-seven million, six hundred eleven thousand, six hundred eighty".