7878778770 has 32 divisors (see below), whose sum is σ = 18957706560. Its totient is φ = 2095603520.

The previous prime is 7878778769. The next prime is 7878778813. The reversal of 7878778770 is 778778787.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 325896 + ... + 349235.

It is an arithmetic number, because the mean of its divisors is an integer number (592428330).

Almost surely, 2^7878778770 is an apocalyptic number.

7878778770 is an abundant number, since it is smaller than the sum of its proper divisors (11078927790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7878778770 is a wasteful number, since it uses less digits than its factorization.

7878778770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675530.

The product of its (nonzero) digits is 60236288, while the sum is 66.

The square root of 7878778770 is about 88762.4851499776. The cubic root of 7878778770 is about 1989.8467740578.

The spelling of 7878778770 in words is "seven billion, eight hundred seventy-eight million, seven hundred seventy-eight thousand, seven hundred seventy".