12778998 has 16 divisors (see below), whose sum is σ = 26152896. Its totient is φ = 4160520.

The previous prime is 12778993. The next prime is 12778999. The reversal of 12778998 is 89987721.

It is a self number, because there is not a number n which added to its sum of digits gives 12778998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778993) 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, 24508 + ... + 25023.

It is an arithmetic number, because the mean of its divisors is an integer number (1634556).

Almost surely, 2^12778998 is an apocalyptic number.

12778998 is an abundant number, since it is smaller than the sum of its proper divisors (13373898).

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

12778998 is a wasteful number, since it uses less digits than its factorization.

12778998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49579.

The product of its digits is 508032, while the sum is 51.

The square root of 12778998 is about 3574.7724403100. The cubic root of 12778998 is about 233.7934110610.

The spelling of 12778998 in words is "twelve million, seven hundred seventy-eight thousand, nine hundred ninety-eight".