8117958640 has 40 divisors (see below), whose sum is σ = 20590097328. Its totient is φ = 2951984640.

The previous prime is 8117958637. The next prime is 8117958659. The reversal of 8117958640 is 468597118.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4611597 + ... + 4613356.

Almost surely, 2^8117958640 is an apocalyptic number.

8117958640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8117958640 is an abundant number, since it is smaller than the sum of its proper divisors (12472138688).

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

8117958640 is a wasteful number, since it uses less digits than its factorization.

8117958640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9224977 (or 9224971 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 8117958640 is about 90099.7149829010. The cubic root of 8117958640 is about 2009.7819652442.

The spelling of 8117958640 in words is "eight billion, one hundred seventeen million, nine hundred fifty-eight thousand, six hundred forty".