647982870 has 64 divisors (see below), whose sum is σ = 1587059136. Its totient is φ = 169274880.

The previous prime is 647982847. The next prime is 647982883. The reversal of 647982870 is 78289746.

It is a congruent number.

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, 579552 + ... + 580668.

It is an arithmetic number, because the mean of its divisors is an integer number (24797799).

Almost surely, 2^647982870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647982870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793529568).

647982870 is an abundant number, since it is smaller than the sum of its proper divisors (939076266).

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

647982870 is a wasteful number, since it uses less digits than its factorization.

647982870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505.

The product of its (nonzero) digits is 1354752, while the sum is 51.

The square root of 647982870 is about 25455.5076555153. The cubic root of 647982870 is about 865.3421168904.

The spelling of 647982870 in words is "six hundred forty-seven million, nine hundred eighty-two thousand, eight hundred seventy".