12778690 has 16 divisors (see below), whose sum is σ = 23623992. Its totient is φ = 4973184.

The previous prime is 12778681. The next prime is 12778691. The reversal of 12778690 is 9687721.

12778690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10673289 + 2105401 = 3267^2 + 1451^2 .

It is a super-2 number, since 2×12778690² = 326589836232200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12778691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16899 + ... + 17638.

Almost surely, 2^12778690 is an apocalyptic number.

12778690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12778690 is a deficient number, since it is larger than the sum of its proper divisors (10845302).

12778690 is a wasteful number, since it uses less digits than its factorization.

12778690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34581.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 12778690 is about 3574.7293603852. The cubic root of 12778690 is about 233.7915327460.

The spelling of 12778690 in words is "twelve million, seven hundred seventy-eight thousand, six hundred ninety".