647873887 has 2 divisors, whose sum is σ = 647873888. Its totient is φ = 647873886.

The previous prime is 647873879. The next prime is 647873917. The reversal of 647873887 is 788378746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647873887 - 2³ = 647873879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647873087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323936943 + 323936944.

It is an arithmetic number, because the mean of its divisors is an integer number (323936944).

Almost surely, 2^647873887 is an apocalyptic number.

647873887 is a deficient number, since it is larger than the sum of its proper divisors (1).

647873887 is an equidigital number, since it uses as much as digits as its factorization.

647873887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12644352, while the sum is 58.

The square root of 647873887 is about 25453.3669089180. The cubic root of 647873887 is about 865.2936007583.

The spelling of 647873887 in words is "six hundred forty-seven million, eight hundred seventy-three thousand, eight hundred eighty-seven".