11005780 has 12 divisors (see below), whose sum is σ = 23112180. Its totient is φ = 4402304.

The previous prime is 11005751. The next prime is 11005793. The reversal of 11005780 is 8750011.

It can be written as a sum of positive squares in 2 ways, for example, as 2502724 + 8503056 = 1582^2 + 2916^2 .

It is a super-2 number, since 2×11005780² = 242254386816800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275125 + ... + 275164.

It is an arithmetic number, because the mean of its divisors is an integer number (1926015).

Almost surely, 2^11005780 is an apocalyptic number.

11005780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11005780 is an abundant number, since it is smaller than the sum of its proper divisors (12106400).

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

11005780 is a wasteful number, since it uses less digits than its factorization.

11005780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550298 (or 550296 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 11005780 is about 3317.4960437053. The cubic root of 11005780 is about 222.4369555844.

Adding to 11005780 its reverse (8750011), we get a palindrome (19755791).

The spelling of 11005780 in words is "eleven million, five thousand, seven hundred eighty".