12078578 has 4 divisors (see below), whose sum is σ = 18117870. Its totient is φ = 6039288.

The previous prime is 12078569. The next prime is 12078581. The reversal of 12078578 is 87587021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10220809 + 1857769 = 3197^2 + 1363^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3019643 + ... + 3019646.

Almost surely, 2^12078578 is an apocalyptic number.

12078578 is a deficient number, since it is larger than the sum of its proper divisors (6039292).

12078578 is an equidigital number, since it uses as much as digits as its factorization.

12078578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6039291.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 12078578 is about 3475.4248661135. The cubic root of 12078578 is about 229.4414803575.

The spelling of 12078578 in words is "twelve million, seventy-eight thousand, five hundred seventy-eight".