7878987417 has 32 divisors (see below), whose sum is σ = 12164104192. Its totient is φ = 4443393024.

The previous prime is 7878987407. The next prime is 7878987427. The reversal of 7878987417 is 7147898787.

It is an interprime number because it is at equal distance from previous prime (7878987407) and next prime (7878987427).

It is not a de Polignac number, because 7878987417 - 2⁶ = 7878987353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7878987407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 507078 + ... + 522384.

It is an arithmetic number, because the mean of its divisors is an integer number (380128256).

Almost surely, 2^7878987417 is an apocalyptic number.

It is an amenable number.

7878987417 is a deficient number, since it is larger than the sum of its proper divisors (4285116775).

7878987417 is a wasteful number, since it uses less digits than its factorization.

7878987417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15637.

The product of its digits is 44255232, while the sum is 66.

The square root of 7878987417 is about 88763.6604529128. The cubic root of 7878987417 is about 1989.8643390429.

The spelling of 7878987417 in words is "seven billion, eight hundred seventy-eight million, nine hundred eighty-seven thousand, four hundred seventeen".