7878849765 has 16 divisors (see below), whose sum is σ = 12783712896. Its totient is φ = 4142868800.

The previous prime is 7878849743. The next prime is 7878849773. The reversal of 7878849765 is 5679488787.

It is not a de Polignac number, because 7878849765 - 2⁶ = 7878849701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7878849765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3697926 + ... + 3700055.

It is an arithmetic number, because the mean of its divisors is an integer number (798982056).

Almost surely, 2^7878849765 is an apocalyptic number.

It is an amenable number.

7878849765 is a deficient number, since it is larger than the sum of its proper divisors (4904863131).

7878849765 is a wasteful number, since it uses less digits than its factorization.

7878849765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7398060.

The product of its digits is 189665280, while the sum is 69.

The square root of 7878849765 is about 88762.8850646485. The cubic root of 7878849765 is about 1989.8527508194.

The spelling of 7878849765 in words is "seven billion, eight hundred seventy-eight million, eight hundred forty-nine thousand, seven hundred sixty-five".