9578777820 has 24 divisors (see below), whose sum is σ = 26820578064. Its totient is φ = 2554340736.

The previous prime is 9578777797. The next prime is 9578777827. The reversal of 9578777820 is 287778759.

9578777820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60), and also a Moran number because the ratio is a prime number: 159646297 = 9578777820 / (9 + 5 + 7 + 8 + 7 + 7 + 7 + 8 + 2 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9578777827) 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 7 ways as a sum of consecutive naturals, for example, 79823089 + ... + 79823208.

It is an arithmetic number, because the mean of its divisors is an integer number (1117524086).

Almost surely, 2^9578777820 is an apocalyptic number.

It is an amenable number.

9578777820 is an abundant number, since it is smaller than the sum of its proper divisors (17241800244).

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

9578777820 is a wasteful number, since it uses less digits than its factorization.

9578777820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159646309 (or 159646307 counting only the distinct ones).

The product of its (nonzero) digits is 13829760, while the sum is 60.

The square root of 9578777820 is about 97871.2308086498. The cubic root of 9578777820 is about 2123.7498765618.

The spelling of 9578777820 in words is "nine billion, five hundred seventy-eight million, seven hundred seventy-seven thousand, eight hundred twenty".