105557780 has 48 divisors (see below), whose sum is σ = 229355280. Its totient is φ = 40780800.

The previous prime is 105557761. The next prime is 105557783. The reversal of 105557780 is 87755501.

It can be written as a sum of positive squares in 8 ways, for example, as 2704 + 105555076 = 52^2 + 10274^2 .

It is a super-2 number, since 2×105557780² = 22284889837056800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105557783) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 88790 + ... + 89970.

It is an arithmetic number, because the mean of its divisors is an integer number (4778235).

Almost surely, 2^105557780 is an apocalyptic number.

105557780 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 105557780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114677640).

105557780 is an abundant number, since it is smaller than the sum of its proper divisors (123797500).

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

105557780 is a wasteful number, since it uses less digits than its factorization.

105557780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 1338 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 38.

The square root of 105557780 is about 10274.1315934730. The cubic root of 105557780 is about 472.6032994568.

The spelling of 105557780 in words is "one hundred five million, five hundred fifty-seven thousand, seven hundred eighty".