12755778 has 48 divisors (see below), whose sum is σ = 30396960. Its totient is φ = 3556224.

The previous prime is 12755767. The next prime is 12755807. The reversal of 12755778 is 87755721.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12138 + ... + 13146.

It is an arithmetic number, because the mean of its divisors is an integer number (633270).

Almost surely, 2^12755778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12755778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15198480).

12755778 is an abundant number, since it is smaller than the sum of its proper divisors (17641182).

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

12755778 is a wasteful number, since it uses less digits than its factorization.

12755778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071 (or 1064 counting only the distinct ones).

The product of its digits is 137200, while the sum is 42.

The square root of 12755778 is about 3571.5232044605. The cubic root of 12755778 is about 233.6517209123.

The spelling of 12755778 in words is "twelve million, seven hundred fifty-five thousand, seven hundred seventy-eight".