12771778 has 8 divisors (see below), whose sum is σ = 19178172. Its totient is φ = 6379056.

The previous prime is 12771769. The next prime is 12771799. The reversal of 12771778 is 87717721.

It can be written as a sum of positive squares in 2 ways, for example, as 12020089 + 751689 = 3467^2 + 867^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12771778.

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, 625 + ... + 5092.

Almost surely, 2^12771778 is an apocalyptic number.

12771778 is a deficient number, since it is larger than the sum of its proper divisors (6406394).

12771778 is a wasteful number, since it uses less digits than its factorization.

12771778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6836.

The product of its digits is 38416, while the sum is 40.

The square root of 12771778 is about 3573.7624431403. The cubic root of 12771778 is about 233.7493724901.

The spelling of 12771778 in words is "twelve million, seven hundred seventy-one thousand, seven hundred seventy-eight".