8664777280 has 28 divisors (see below), whose sum is σ = 20633001660. Its totient is φ = 3465910784.

The previous prime is 8664777181. The next prime is 8664777287. The reversal of 8664777280 is 827774668.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1445216256 + 7219561024 = 38016^2 + 84968^2 .

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (8664777287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13538395 + ... + 13539034.

Almost surely, 2^8664777280 is an apocalyptic number.

8664777280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8664777280 is an abundant number, since it is smaller than the sum of its proper divisors (11968224380).

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

8664777280 is a wasteful number, since it uses less digits than its factorization.

8664777280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27077446 (or 27077436 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 55.

The square root of 8664777280 is about 93084.7854377932. The cubic root of 8664777280 is about 2053.9307710376.

The spelling of 8664777280 in words is "eight billion, six hundred sixty-four million, seven hundred seventy-seven thousand, two hundred eighty".