12778558 has 8 divisors (see below), whose sum is σ = 20642328. Its totient is φ = 5897784.

The previous prime is 12778553. The next prime is 12778559. The reversal of 12778558 is 85587721.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245716 + ... + 245767.

It is an arithmetic number, because the mean of its divisors is an integer number (2580291).

Almost surely, 2^12778558 is an apocalyptic number.

12778558 is a deficient number, since it is larger than the sum of its proper divisors (7863770).

12778558 is a wasteful number, since it uses less digits than its factorization.

12778558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491498.

The product of its digits is 156800, while the sum is 43.

The square root of 12778558 is about 3574.7108974014. The cubic root of 12778558 is about 233.7907277447.

The spelling of 12778558 in words is "twelve million, seven hundred seventy-eight thousand, five hundred fifty-eight".