115111720 has 32 divisors (see below), whose sum is σ = 261574920. Its totient is φ = 45587200.

The previous prime is 115111693. The next prime is 115111727. The reversal of 115111720 is 27111511.

115111720 = T₁₄₅₉ + T₁₄₆₀ + ... + T₁₅₅₉.

It can be written as a sum of positive squares in 4 ways, for example, as 112402404 + 2709316 = 10602^2 + 1646^2 .

It is not an unprimeable number, because it can be changed into a prime (115111727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10207 + ... + 18286.

Almost surely, 2^115111720 is an apocalyptic number.

115111720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115111720 is an abundant number, since it is smaller than the sum of its proper divisors (146463200).

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

115111720 is a wasteful number, since it uses less digits than its factorization.

115111720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28605 (or 28601 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 19.

The square root of 115111720 is about 10729.0130021358. The cubic root of 115111720 is about 486.4518369594.

It can be divided in two parts, 11511 and 1720, that added together give a palindrome (13231).

The spelling of 115111720 in words is "one hundred fifteen million, one hundred eleven thousand, seven hundred twenty".