12729280 has 28 divisors (see below), whose sum is σ = 30312360. Its totient is φ = 5091584.

The previous prime is 12729271. The next prime is 12729293. The reversal of 12729280 is 8292721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19570 + ... + 20209.

Almost surely, 2^12729280 is an apocalyptic number.

12729280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12729280 is an abundant number, since it is smaller than the sum of its proper divisors (17583080).

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

12729280 is an equidigital number, since it uses as much as digits as its factorization.

12729280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39796 (or 39786 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 12729280 is about 3567.8116542217. The cubic root of 12729280 is about 233.4898179329.

The spelling of 12729280 in words is "twelve million, seven hundred twenty-nine thousand, two hundred eighty".