117691128 has 96 divisors (see below), whose sum is σ = 334364160. Its totient is φ = 37350720.

The previous prime is 117691127. The next prime is 117691141. The reversal of 117691128 is 821196711.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 117691092 and 117691101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117691121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149151 + ... + 149937.

It is an arithmetic number, because the mean of its divisors is an integer number (3482960).

Almost surely, 2^117691128 is an apocalyptic number.

117691128 is a gapful number since it is divisible by the number (18) 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 117691128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167182080).

117691128 is an abundant number, since it is smaller than the sum of its proper divisors (216673032).

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

117691128 is a wasteful number, since it uses less digits than its factorization.

117691128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897 (or 890 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The square root of 117691128 is about 10848.5541893839. The cubic root of 117691128 is about 490.0584797620.

The spelling of 117691128 in words is "one hundred seventeen million, six hundred ninety-one thousand, one hundred twenty-eight".