6478261 has 6 divisors (see below), whose sum is σ = 6589986. Its totient is φ = 6368400.

The previous prime is 6478229. The next prime is 6478267. The reversal of 6478261 is 1628746.

It can be written as a sum of positive squares in 3 ways, for example, as 1988100 + 4490161 = 1410^2 + 2119^2 .

It is not a de Polignac number, because 6478261 - 2⁵ = 6478229 is a prime.

It is a Duffinian number.

6478261 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6478267) 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 in 5 ways as a sum of consecutive naturals, for example, 2851 + ... + 4591.

It is an arithmetic number, because the mean of its divisors is an integer number (1098331).

Almost surely, 2^6478261 is an apocalyptic number.

6478261 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6478261 is a deficient number, since it is larger than the sum of its proper divisors (111725).

6478261 is an equidigital number, since it uses as much as digits as its factorization.

6478261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863 (or 1802 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 6478261 is about 2545.2428174931. The cubic root of 6478261 is about 186.4172714660.

The spelling of 6478261 in words is "six million, four hundred seventy-eight thousand, two hundred sixty-one".