647479873 has 2 divisors, whose sum is σ = 647479874. Its totient is φ = 647479872.

The previous prime is 647479837. The next prime is 647479927. The reversal of 647479873 is 378974746.

Together with previous prime (647479837) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411765264 + 235714609 = 20292^2 + 15353^2 .

It is a cyclic number.

It is not a de Polignac number, because 647479873 - 2¹³ = 647471681 is a prime.

It is a super-2 number, since 2×647479873² = 838460371880192258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (647479073) 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, 323739936 + 323739937.

It is an arithmetic number, because the mean of its divisors is an integer number (323739937).

Almost surely, 2^647479873 is an apocalyptic number.

It is an amenable number.

647479873 is a deficient number, since it is larger than the sum of its proper divisors (1).

647479873 is an equidigital number, since it uses as much as digits as its factorization.

647479873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7112448, while the sum is 55.

The square root of 647479873 is about 25445.6258127011. The cubic root of 647479873 is about 865.1181515243.

The spelling of 647479873 in words is "six hundred forty-seven million, four hundred seventy-nine thousand, eight hundred seventy-three".