117312720 has 80 divisors (see below), whose sum is σ = 415628160. Its totient is φ = 26813952.

The previous prime is 117312683. The next prime is 117312721. The reversal of 117312720 is 27213711.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117312721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33235 + ... + 36594.

It is an arithmetic number, because the mean of its divisors is an integer number (5195352).

Almost surely, 2^117312720 is an apocalyptic number.

117312720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117312720 is an abundant number, since it is smaller than the sum of its proper divisors (298315440).

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

117312720 is a wasteful number, since it uses less digits than its factorization.

117312720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69852 (or 69846 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 117312720 is about 10831.0996671621. The cubic root of 117312720 is about 489.5326934474.

Subtracting from 117312720 its reverse (27213711), we obtain a palindrome (90099009).

The spelling of 117312720 in words is "one hundred seventeen million, three hundred twelve thousand, seven hundred twenty".