647237867 has 2 divisors, whose sum is σ = 647237868. Its totient is φ = 647237866.

The previous prime is 647237839. The next prime is 647237891. The reversal of 647237867 is 768732746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647237867 - 2²⁶ = 580129003 is a prime.

It is not a weakly prime, because it can be changed into another prime (647237467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323618933 + 323618934.

It is an arithmetic number, because the mean of its divisors is an integer number (323618934).

Almost surely, 2^647237867 is an apocalyptic number.

647237867 is a deficient number, since it is larger than the sum of its proper divisors (1).

647237867 is an equidigital number, since it uses as much as digits as its factorization.

647237867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 50.

The square root of 647237867 is about 25440.8700126391. The cubic root of 647237867 is about 865.0103541590.

The spelling of 647237867 in words is "six hundred forty-seven million, two hundred thirty-seven thousand, eight hundred sixty-seven".