7768742220 has 36 divisors (see below), whose sum is σ = 23565185280. Its totient is φ = 2071664544.

The previous prime is 7768742159. The next prime is 7768742221. The reversal of 7768742220 is 222478677.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (7768742221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21579660 + ... + 21580019.

It is an arithmetic number, because the mean of its divisors is an integer number (654588480).

Almost surely, 2^7768742220 is an apocalyptic number.

It is an amenable number.

7768742220 is an abundant number, since it is smaller than the sum of its proper divisors (15796443060).

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

7768742220 is a wasteful number, since it uses less digits than its factorization.

7768742220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43159694 (or 43159689 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 45.

The square root of 7768742220 is about 88140.4686849350. The cubic root of 7768742220 is about 1980.5397824316.

The spelling of 7768742220 in words is "seven billion, seven hundred sixty-eight million, seven hundred forty-two thousand, two hundred twenty".