647897880 has 256 divisors, whose sum is σ = 2395008000. Its totient is φ = 136839168.

The previous prime is 647897869. The next prime is 647897959. The reversal of 647897880 is 88798746.

It is a self number, because there is not a number n which added to its sum of digits gives 647897880.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 842136 + ... + 842904.

It is an arithmetic number, because the mean of its divisors is an integer number (9355500).

Almost surely, 2^647897880 is an apocalyptic number.

647897880 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 647897880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1197504000).

647897880 is an abundant number, since it is smaller than the sum of its proper divisors (1747110120).

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

647897880 is a wasteful number, since it uses less digits than its factorization.

647897880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 57.

The square root of 647897880 is about 25453.8382174477. The cubic root of 647897880 is about 865.3042822265.

The spelling of 647897880 in words is "six hundred forty-seven million, eight hundred ninety-seven thousand, eight hundred eighty".