115611640 has 32 divisors (see below), whose sum is σ = 261862560. Its totient is φ = 45936000.

The previous prime is 115611631. The next prime is 115611641. The reversal of 115611640 is 46116511.

It is a super-3 number, since 3×115611640³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115611641) 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, 3531 + ... + 15610.

It is an arithmetic number, because the mean of its divisors is an integer number (8183205).

Almost surely, 2^115611640 is an apocalyptic number.

115611640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115611640 is an abundant number, since it is smaller than the sum of its proper divisors (146250920).

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

115611640 is a wasteful number, since it uses less digits than its factorization.

115611640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19303 (or 19299 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 115611640 is about 10752.2853384757. The cubic root of 115611640 is about 487.1550257188.

The spelling of 115611640 in words is "one hundred fifteen million, six hundred eleven thousand, six hundred forty".