8440921688 has 16 divisors (see below), whose sum is σ = 15980387280. Its totient is φ = 4179485088.

The previous prime is 8440921661. The next prime is 8440921693. The reversal of 8440921688 is 8861290448.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5121095 + ... + 5122742.

It is an arithmetic number, because the mean of its divisors is an integer number (998774205).

Almost surely, 2^8440921688 is an apocalyptic number.

It is an amenable number.

8440921688 is a deficient number, since it is larger than the sum of its proper divisors (7539465592).

8440921688 is a wasteful number, since it uses less digits than its factorization.

8440921688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10243946 (or 10243942 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 50.

The square root of 8440921688 is about 91874.4887768090. The cubic root of 8440921688 is about 2036.0883720003.

The spelling of 8440921688 in words is "eight billion, four hundred forty million, nine hundred twenty-one thousand, six hundred eighty-eight".