115507207640 has 128 divisors (see below), whose sum is σ = 293961960000. Its totient is φ = 40461926400.

The previous prime is 115507207631. The next prime is 115507207649. The reversal of 115507207640 is 46702705511.

It is an interprime number because it is at equal distance from previous prime (115507207631) and next prime (115507207649).

It is a junction number, because it is equal to n+sod(n) for n = 115507207594 and 115507207603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115507207649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5719160 + ... + 5739320.

Almost surely, 2^115507207640 is an apocalyptic number.

115507207640 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 115507207640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146980980000).

115507207640 is an abundant number, since it is smaller than the sum of its proper divisors (178454752360).

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

115507207640 is a wasteful number, since it uses less digits than its factorization.

115507207640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20661 (or 20657 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 38.

The spelling of 115507207640 in words is "one hundred fifteen billion, five hundred seven million, two hundred seven thousand, six hundred forty".