11720640 has 112 divisors (see below), whose sum is σ = 38587680. Its totient is φ = 3010560.

The previous prime is 11720627. The next prime is 11720641. The reversal of 11720640 is 4602711.

11720640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11720641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27630 + ... + 28050.

Almost surely, 2^11720640 is an apocalyptic number.

11720640 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 11720640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19293840).

11720640 is an abundant number, since it is smaller than the sum of its proper divisors (26867040).

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

11720640 is a wasteful number, since it uses less digits than its factorization.

11720640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 11720640 is about 3423.5420254467. The cubic root of 11720640 is about 227.1522844980.

The spelling of 11720640 in words is "eleven million, seven hundred twenty thousand, six hundred forty".