11687720 has 64 divisors (see below), whose sum is σ = 29082240. Its totient is φ = 4192000.

The previous prime is 11687699. The next prime is 11687759. The reversal of 11687720 is 2778611.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 44309 + ... + 44571.

It is an arithmetic number, because the mean of its divisors is an integer number (454410).

Almost surely, 2^11687720 is an apocalyptic number.

11687720 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 11687720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14541120).

11687720 is an abundant number, since it is smaller than the sum of its proper divisors (17394520).

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

11687720 is a wasteful number, since it uses less digits than its factorization.

11687720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 11687720 is about 3418.7307586296. The cubic root of 11687720 is about 226.9394159966.

It can be divided in two parts, 1168 and 7720, that added together give a palindrome (8888).

The spelling of 11687720 in words is "eleven million, six hundred eighty-seven thousand, seven hundred twenty".