117791720 has 32 divisors (see below), whose sum is σ = 272197800. Its totient is φ = 45842688.

The previous prime is 117791719. The next prime is 117791731. The reversal of 117791720 is 27197711.

It can be written as a sum of positive squares in 4 ways, for example, as 101324356 + 16467364 = 10066^2 + 4058^2 .

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, 38315 + ... + 41274.

Almost surely, 2^117791720 is an apocalyptic number.

117791720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117791720 is an abundant number, since it is smaller than the sum of its proper divisors (154406080).

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

117791720 is a wasteful number, since it uses less digits than its factorization.

117791720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79637 (or 79633 counting only the distinct ones).

The product of its (nonzero) digits is 6174, while the sum is 35.

The square root of 117791720 is about 10853.1893929849. The cubic root of 117791720 is about 490.1980595969.

The spelling of 117791720 in words is "one hundred seventeen million, seven hundred ninety-one thousand, seven hundred twenty".