11712780 has 36 divisors (see below), whose sum is σ = 35529312. Its totient is φ = 3123360.

The previous prime is 11712763. The next prime is 11712787. The reversal of 11712780 is 8721711.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (11712787) 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 11 ways as a sum of consecutive naturals, for example, 32356 + ... + 32715.

Almost surely, 2^11712780 is an apocalyptic number.

11712780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11712780 is an abundant number, since it is smaller than the sum of its proper divisors (23816532).

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

11712780 is a wasteful number, since it uses less digits than its factorization.

11712780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65086 (or 65081 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 11712780 is about 3422.3938990128. The cubic root of 11712780 is about 227.1014961391.

The spelling of 11712780 in words is "eleven million, seven hundred twelve thousand, seven hundred eighty".