647876643 has 8 divisors (see below), whose sum is σ = 864552528. Its totient is φ = 431559264.

The previous prime is 647876641. The next prime is 647876651. The reversal of 647876643 is 346678746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 647876643 - 2¹ = 647876641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647876641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85380 + ... + 92657.

It is an arithmetic number, because the mean of its divisors is an integer number (108069066).

Almost surely, 2^647876643 is an apocalyptic number.

647876643 is a deficient number, since it is larger than the sum of its proper divisors (216675885).

647876643 is a wasteful number, since it uses less digits than its factorization.

647876643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179253.

The product of its digits is 4064256, while the sum is 51.

The square root of 647876643 is about 25453.4210470813. The cubic root of 647876643 is about 865.2948277181.

The spelling of 647876643 in words is "six hundred forty-seven million, eight hundred seventy-six thousand, six hundred forty-three".