12720256 has 16 divisors (see below), whose sum is σ = 25341390. Its totient is φ = 6360064.

The previous prime is 12720247. The next prime is 12720271. The reversal of 12720256 is 65202721.

It can be written as a sum of positive squares in only one way, i.e., 12673600 + 46656 = 3560^2 + 216^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 12720256.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49561 + ... + 49816.

Almost surely, 2^12720256 is an apocalyptic number.

12720256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12720256 is a deficient number, since it is larger than the sum of its proper divisors (12621134).

12720256 is an frugal number, since it uses more digits than its factorization.

12720256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99391 (or 99379 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 12720256 is about 3566.5467892627. The cubic root of 12720256 is about 233.4346299408.

Adding to 12720256 its reverse (65202721), we get a palindrome (77922977).

The spelling of 12720256 in words is "twelve million, seven hundred twenty thousand, two hundred fifty-six".