647605980 has 144 divisors (see below), whose sum is σ = 2257295040. Its totient is φ = 147216384.

The previous prime is 647605979. The next prime is 647605999. The reversal of 647605980 is 89506746.

647605980 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 246916 + ... + 249524.

It is an arithmetic number, because the mean of its divisors is an integer number (15675660).

Almost surely, 2^647605980 is an apocalyptic number.

647605980 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 647605980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128647520).

647605980 is an abundant number, since it is smaller than the sum of its proper divisors (1609689060).

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

647605980 is a wasteful number, since it uses less digits than its factorization.

647605980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828 (or 2823 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 647605980 is about 25448.1036621592. The cubic root of 647605980 is about 865.1743130500.

The spelling of 647605980 in words is "six hundred forty-seven million, six hundred five thousand, nine hundred eighty".