12800000 has 78 divisors (see below), whose sum is σ = 31994046. Its totient is φ = 5120000.

The previous prime is 12799987. The next prime is 12800009. The reversal of 12800000 is 821.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 3 ways, for example, as 5914624 + 6885376 = 2432^2 + 2624^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12800009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2559998 + ... + 2560002.

Almost surely, 2^12800000 is an apocalyptic number.

12800000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12800000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15997023).

12800000 is an abundant number, since it is smaller than the sum of its proper divisors (19194046).

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

12800000 is an frugal number, since it uses more digits than its factorization.

12800000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 12800000 is about 3577.7087639997. The cubic root of 12800000 is about 233.9214190570.

Adding to 12800000 its reverse (821), we get a palindrome (12800821).

The spelling of 12800000 in words is "twelve million, eight hundred thousand".