8717021964 has 72 divisors (see below), whose sum is σ = 25262179488. Its totient is φ = 2482698240.

The previous prime is 8717021953. The next prime is 8717021977. The reversal of 8717021964 is 4691207178.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25324 + ... + 134444.

It is an arithmetic number, because the mean of its divisors is an integer number (350863604).

Almost surely, 2^8717021964 is an apocalyptic number.

8717021964 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8717021964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12631089744).

8717021964 is an abundant number, since it is smaller than the sum of its proper divisors (16545157524).

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

8717021964 is a wasteful number, since it uses less digits than its factorization.

8717021964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109455 (or 109450 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 8717021964 is about 93364.9932469338. The cubic root of 8717021964 is about 2058.0505927548.

The spelling of 8717021964 in words is "eight billion, seven hundred seventeen million, twenty-one thousand, nine hundred sixty-four".