647880663 has 4 divisors (see below), whose sum is σ = 863840888. Its totient is φ = 431920440.

The previous prime is 647880661. The next prime is 647880671. The reversal of 647880663 is 366088746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 647880663 - 2¹ = 647880661 is a prime.

It is the 25454-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647880661) by changing a digit.

It is a nontrivial repunit in base 25453.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107980108 + ... + 107980113.

It is an arithmetic number, because the mean of its divisors is an integer number (215960222).

Almost surely, 2^647880663 is an apocalyptic number.

647880663 is a deficient number, since it is larger than the sum of its proper divisors (215960225).

647880663 is a wasteful number, since it uses less digits than its factorization.

647880663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215960224.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 647880663 is about 25453.5000147327. The cubic root of 647880663 is about 865.2966173994.

The spelling of 647880663 in words is "six hundred forty-seven million, eight hundred eighty thousand, six hundred sixty-three".