7878649317 has 32 divisors (see below), whose sum is σ = 13118576640. Its totient is φ = 4086054720.

The previous prime is 7878649283. The next prime is 7878649357. The reversal of 7878649317 is 7139468787.

It is not a de Polignac number, because 7878649317 - 2⁸ = 7878649061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878649357) 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 31 ways as a sum of consecutive naturals, for example, 113784 + ... + 169422.

It is an arithmetic number, because the mean of its divisors is an integer number (409955520).

Almost surely, 2^7878649317 is an apocalyptic number.

7878649317 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

7878649317 is a deficient number, since it is larger than the sum of its proper divisors (5239927323).

7878649317 is a wasteful number, since it uses less digits than its factorization.

7878649317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56273.

The product of its digits is 14224896, while the sum is 60.

The square root of 7878649317 is about 88761.7559368898. The cubic root of 7878649317 is about 1989.8358758779.

The spelling of 7878649317 in words is "seven billion, eight hundred seventy-eight million, six hundred forty-nine thousand, three hundred seventeen".