12778992 has 40 divisors (see below), whose sum is σ = 36681680. Its totient is φ = 4259520.

The previous prime is 12778981. The next prime is 12778993. The reversal of 12778992 is 29987721.

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, 14359 + ... + 15222.

It is an arithmetic number, because the mean of its divisors is an integer number (917042).

Almost surely, 2^12778992 is an apocalyptic number.

12778992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12778992 is an abundant number, since it is smaller than the sum of its proper divisors (23902688).

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

12778992 is a wasteful number, since it uses less digits than its factorization.

12778992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29598 (or 29586 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 12778992 is about 3574.7716010957. The cubic root of 12778992 is about 233.7933744707.

The spelling of 12778992 in words is "twelve million, seven hundred seventy-eight thousand, nine hundred ninety-two".