11512780 has 36 divisors (see below), whose sum is σ = 25023600. Its totient is φ = 4449120.

The previous prime is 11512769. The next prime is 11512789. The reversal of 11512780 is 8721511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11512789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18921 + ... + 19519.

It is an arithmetic number, because the mean of its divisors is an integer number (695100).

Almost surely, 2^11512780 is an apocalyptic number.

11512780 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 11512780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12511800).

11512780 is an abundant number, since it is smaller than the sum of its proper divisors (13510820).

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

11512780 is a wasteful number, since it uses less digits than its factorization.

11512780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 11512780 is about 3393.0487765430. The cubic root of 11512780 is about 225.8014545701.

The spelling of 11512780 in words is "eleven million, five hundred twelve thousand, seven hundred eighty".