11663878 has 4 divisors (see below), whose sum is σ = 17495820. Its totient is φ = 5831938.

The previous prime is 11663863. The next prime is 11663893. The reversal of 11663878 is 87836611.

11663878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87836611 = 1889 ⋅46499.

It is an interprime number because it is at equal distance from previous prime (11663863) and next prime (11663893).

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 11663878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2915968 + ... + 2915971.

It is an arithmetic number, because the mean of its divisors is an integer number (4373955).

Almost surely, 2^11663878 is an apocalyptic number.

11663878 is a deficient number, since it is larger than the sum of its proper divisors (5831942).

11663878 is an equidigital number, since it uses as much as digits as its factorization.

11663878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5831941.

The product of its digits is 48384, while the sum is 40.

The square root of 11663878 is about 3415.2420119224. The cubic root of 11663878 is about 226.7849982871.

The spelling of 11663878 in words is "eleven million, six hundred sixty-three thousand, eight hundred seventy-eight".