8647478772 has 12 divisors (see below), whose sum is σ = 20177450496. Its totient is φ = 2882492920.

The previous prime is 8647478729. The next prime is 8647478773. The reversal of 8647478772 is 2778747468.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×8647478772² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8647478773) 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, 360311604 + ... + 360311627.

It is an arithmetic number, because the mean of its divisors is an integer number (1681454208).

Almost surely, 2^8647478772 is an apocalyptic number.

It is an amenable number.

8647478772 is an abundant number, since it is smaller than the sum of its proper divisors (11529971724).

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

8647478772 is a wasteful number, since it uses less digits than its factorization.

8647478772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720623238 (or 720623236 counting only the distinct ones).

The product of its digits is 29503488, while the sum is 60.

The square root of 8647478772 is about 92991.8209951822. The cubic root of 8647478772 is about 2052.5630263868.

The spelling of 8647478772 in words is "eight billion, six hundred forty-seven million, four hundred seventy-eight thousand, seven hundred seventy-two".