11778478 has 4 divisors (see below), whose sum is σ = 17667720. Its totient is φ = 5889238.

The previous prime is 11778463. The next prime is 11778479. The reversal of 11778478 is 87487711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87487711 = 2903 ⋅30137.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11778479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2944618 + ... + 2944621.

It is an arithmetic number, because the mean of its divisors is an integer number (4416930).

Almost surely, 2^11778478 is an apocalyptic number.

11778478 is a deficient number, since it is larger than the sum of its proper divisors (5889242).

11778478 is an equidigital number, since it uses as much as digits as its factorization.

11778478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5889241.

The product of its digits is 87808, while the sum is 43.

The square root of 11778478 is about 3431.9787295378. The cubic root of 11778478 is about 227.5253153812.

The spelling of 11778478 in words is "eleven million, seven hundred seventy-eight thousand, four hundred seventy-eight".