11621780 has 12 divisors (see below), whose sum is σ = 24405780. Its totient is φ = 4648704.

The previous prime is 11621773. The next prime is 11621783. The reversal of 11621780 is 8712611.

It can be written as a sum of positive squares in 2 ways, for example, as 6728836 + 4892944 = 2594^2 + 2212^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11621783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290525 + ... + 290564.

It is an arithmetic number, because the mean of its divisors is an integer number (2033815).

Almost surely, 2^11621780 is an apocalyptic number.

11621780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11621780 is an abundant number, since it is smaller than the sum of its proper divisors (12784000).

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

11621780 is a wasteful number, since it uses less digits than its factorization.

11621780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581098 (or 581096 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 11621780 is about 3409.0731878327. The cubic root of 11621780 is about 226.5118271612.

The spelling of 11621780 in words is "eleven million, six hundred twenty-one thousand, seven hundred eighty".