115665720 has 64 divisors (see below), whose sum is σ = 349380000. Its totient is φ = 30632448.

The previous prime is 115665713. The next prime is 115665727. The reversal of 115665720 is 27566511.

It is an interprime number because it is at equal distance from previous prime (115665713) and next prime (115665727).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115665727) 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, 14646 + ... + 21114.

Almost surely, 2^115665720 is an apocalyptic number.

115665720 is a gapful number since it is divisible by the number (10) 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 115665720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174690000).

115665720 is an abundant number, since it is smaller than the sum of its proper divisors (233714280).

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

115665720 is a wasteful number, since it uses less digits than its factorization.

115665720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632 (or 6628 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 115665720 is about 10754.7998586678. The cubic root of 115665720 is about 487.2309731954.

The spelling of 115665720 in words is "one hundred fifteen million, six hundred sixty-five thousand, seven hundred twenty".