8809747947 has 128 divisors (see below), whose sum is σ = 17774346240. Its totient is φ = 4164048000.

The previous prime is 8809747943. The next prime is 8809747949. The reversal of 8809747947 is 7497479088.

It is a happy number.

It is not a de Polignac number, because 8809747947 - 2² = 8809747943 is a prime.

It is a super-2 number, since 2×8809747947² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (8809747943) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1916622 + ... + 1921212.

It is an arithmetic number, because the mean of its divisors is an integer number (138862080).

Almost surely, 2^8809747947 is an apocalyptic number.

8809747947 is an abundant number, since it is smaller than the sum of its proper divisors (8964598293).

8809747947 is a wasteful number, since it uses less digits than its factorization.

8809747947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4702 (or 4696 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 63.

The square root of 8809747947 is about 93860.2575481231. The cubic root of 8809747947 is about 2065.3222686867.

The spelling of 8809747947 in words is "eight billion, eight hundred nine million, seven hundred forty-seven thousand, nine hundred forty-seven".