647968552 has 144 divisors (see below), whose sum is σ = 1637496000. Its totient is φ = 238835520.

The previous prime is 647968543. The next prime is 647968561. The reversal of 647968552 is 255869746.

It is an interprime number because it is at equal distance from previous prime (647968543) and next prime (647968561).

It is a self number, because there is not a number n which added to its sum of digits gives 647968552.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 900849 + ... + 901567.

It is an arithmetic number, because the mean of its divisors is an integer number (11371500).

Almost surely, 2^647968552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647968552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818748000).

647968552 is an abundant number, since it is smaller than the sum of its proper divisors (989527448).

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

647968552 is a wasteful number, since it uses less digits than its factorization.

647968552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 758 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 52.

The square root of 647968552 is about 25455.2264181641. The cubic root of 647968552 is about 865.3357432344.

The spelling of 647968552 in words is "six hundred forty-seven million, nine hundred sixty-eight thousand, five hundred fifty-two".