12605778 has 96 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 3628800.

The previous prime is 12605767. The next prime is 12605779. The reversal of 12605778 is 87750621.

It is not an unprimeable number, because it can be changed into a prime (12605779) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 307438 + ... + 307478.

It is an arithmetic number, because the mean of its divisors is an integer number (327600).

Almost surely, 2^12605778 is an apocalyptic number.

12605778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12605778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15724800).

12605778 is an abundant number, since it is smaller than the sum of its proper divisors (18843822).

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

12605778 is a wasteful number, since it uses less digits than its factorization.

12605778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 12605778 is about 3550.4616601225. The cubic root of 12605778 is about 232.7322410586.

The spelling of 12605778 in words is "twelve million, six hundred five thousand, seven hundred seventy-eight".