11816720 has 20 divisors (see below), whose sum is σ = 27474060. Its totient is φ = 4726656.

The previous prime is 11816719. The next prime is 11816731. The reversal of 11816720 is 2761811.

It can be written as a sum of positive squares in 2 ways, for example, as 3429904 + 8386816 = 1852^2 + 2896^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 11816720.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73775 + ... + 73934.

It is an arithmetic number, because the mean of its divisors is an integer number (1373703).

Almost surely, 2^11816720 is an apocalyptic number.

11816720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11816720 is an abundant number, since it is smaller than the sum of its proper divisors (15657340).

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

11816720 is a wasteful number, since it uses less digits than its factorization.

11816720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147722 (or 147716 counting only the distinct ones).

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

The square root of 11816720 is about 3437.5456360607. The cubic root of 11816720 is about 227.7712900966.

The spelling of 11816720 in words is "eleven million, eight hundred sixteen thousand, seven hundred twenty".