11777778 has 16 divisors (see below), whose sum is σ = 26172960. Its totient is φ = 3925908.

The previous prime is 11777723. The next prime is 11777789. The reversal of 11777778 is 87777711.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109000 + ... + 109107.

It is an arithmetic number, because the mean of its divisors is an integer number (1635810).

Almost surely, 2^11777778 is an apocalyptic number.

11777778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11777778 is an abundant number, since it is smaller than the sum of its proper divisors (14395182).

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

11777778 is a wasteful number, since it uses less digits than its factorization.

11777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218118 (or 218112 counting only the distinct ones).

The product of its digits is 134456, while the sum is 45.

The square root of 11777778 is about 3431.8767460385. The cubic root of 11777778 is about 227.5208079829.

It can be divided in two parts, 117777 and 78, that added together give a triangular number (117855 = T₄₈₅).

The spelling of 11777778 in words is "eleven million, seven hundred seventy-seven thousand, seven hundred seventy-eight".