647678896 has 40 divisors (see below), whose sum is σ = 1312416000. Its totient is φ = 309055296.

The previous prime is 647678839. The next prime is 647678909. The reversal of 647678896 is 698876746.

647678896 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 7 ways as a sum of consecutive naturals, for example, 183355 + ... + 186853.

It is an arithmetic number, because the mean of its divisors is an integer number (32810400).

Almost surely, 2^647678896 is an apocalyptic number.

647678896 is the 16096-th heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647678896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (656208000).

647678896 is an abundant number, since it is smaller than the sum of its proper divisors (664737104).

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

647678896 is a wasteful number, since it uses less digits than its factorization.

647678896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033 (or 4027 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 61.

The square root of 647678896 is about 25449.5362629656. The cubic root of 647678896 is about 865.2067827330.

The spelling of 647678896 in words is "six hundred forty-seven million, six hundred seventy-eight thousand, eight hundred ninety-six".