2678581217 has 24 divisors (see below), whose sum is σ = 3077505144. Its totient is φ = 2322238464.

The previous prime is 2678581207. The next prime is 2678581237. The reversal of 2678581217 is 7121858762.

It can be written as a sum of positive squares in 12 ways, for example, as 791634496 + 1886946721 = 28136^2 + 43439^2 .

It is not a de Polignac number, because 2678581217 - 2⁶ = 2678581153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2678581207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2450123 + ... + 2451215.

It is an arithmetic number, because the mean of its divisors is an integer number (128229381).

Almost surely, 2^2678581217 is an apocalyptic number.

It is an amenable number.

2678581217 is a deficient number, since it is larger than the sum of its proper divisors (398923927).

2678581217 is a wasteful number, since it uses less digits than its factorization.

2678581217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1976 counting only the distinct ones).

The product of its digits is 376320, while the sum is 47.

The square root of 2678581217 is about 51755.0115157943. The cubic root of 2678581217 is about 1388.7847524157.

The spelling of 2678581217 in words is "two billion, six hundred seventy-eight million, five hundred eighty-one thousand, two hundred seventeen".