7878508313 has 8 divisors (see below), whose sum is σ = 8485374408. Its totient is φ = 7271760384.

The previous prime is 7878508303. The next prime is 7878508349. The reversal of 7878508313 is 3138058787.

It can be written as a sum of positive squares in 4 ways, for example, as 1426723984 + 6451784329 = 37772^2 + 80323^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7878508313 - 2²² = 7874314009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7878508303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148895 + ... + 194747.

It is an arithmetic number, because the mean of its divisors is an integer number (1060671801).

Almost surely, 2^7878508313 is an apocalyptic number.

It is an amenable number.

7878508313 is a deficient number, since it is larger than the sum of its proper divisors (606866095).

7878508313 is a wasteful number, since it uses less digits than its factorization.

7878508313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59083.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The square root of 7878508313 is about 88760.9616498154. The cubic root of 7878508313 is about 1989.8240051252.

The spelling of 7878508313 in words is "seven billion, eight hundred seventy-eight million, five hundred eight thousand, three hundred thirteen".