7878779 has 4 divisors (see below), whose sum is σ = 7955376. Its totient is φ = 7802184.

The previous prime is 7878763. The next prime is 7878791. The reversal of 7878779 is 9778787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7878779 - 2⁴ = 7878763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7878779.

It is not an unprimeable number, because it can be changed into a prime (7878709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38144 + ... + 38349.

It is an arithmetic number, because the mean of its divisors is an integer number (1988844).

Almost surely, 2^7878779 is an apocalyptic number.

7878779 is a deficient number, since it is larger than the sum of its proper divisors (76597).

7878779 is a wasteful number, since it uses less digits than its factorization.

7878779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76596.

The product of its digits is 1382976, while the sum is 53.

The square root of 7878779 is about 2806.9162794782. The cubic root of 7878779 is about 198.9846793421.

The spelling of 7878779 in words is "seven million, eight hundred seventy-eight thousand, seven hundred seventy-nine".