647647080 has 128 divisors (see below), whose sum is σ = 1999451520. Its totient is φ = 167731200.

The previous prime is 647647073. The next prime is 647647103. The reversal of 647647080 is 80746746.

647647080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1614880 + ... + 1615280.

It is an arithmetic number, because the mean of its divisors is an integer number (15620715).

Almost surely, 2^647647080 is an apocalyptic number.

647647080 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 647647080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999725760).

647647080 is an abundant number, since it is smaller than the sum of its proper divisors (1351804440).

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

647647080 is a wasteful number, since it uses less digits than its factorization.

647647080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 647647080 is about 25448.9111751367. The cubic root of 647647080 is about 865.1926152858.

The spelling of 647647080 in words is "six hundred forty-seven million, six hundred forty-seven thousand, eighty".