115779780 has 96 divisors (see below), whose sum is σ = 364788480. Its totient is φ = 30862944.

The previous prime is 115779773. The next prime is 115779817. The reversal of 115779780 is 87977511.

It is a happy number.

115779780 is a `hidden beast` number, since 1 + 1 + 577 + 9 + 78 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42417 + ... + 45063.

It is an arithmetic number, because the mean of its divisors is an integer number (3799880).

Almost surely, 2^115779780 is an apocalyptic number.

115779780 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 115779780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182394240).

115779780 is an abundant number, since it is smaller than the sum of its proper divisors (249008700).

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

115779780 is an equidigital number, since it uses as much as digits as its factorization.

115779780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677 (or 2657 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 45.

The square root of 115779780 is about 10760.1013006384. The cubic root of 115779780 is about 487.3910762563.

The spelling of 115779780 in words is "one hundred fifteen million, seven hundred seventy-nine thousand, seven hundred eighty".