13720256 has 28 divisors (see below), whose sum is σ = 29702760. Its totient is φ = 6236160.

The previous prime is 13720247. The next prime is 13720271. The reversal of 13720256 is 65202731.

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, 9041 + ... + 10448.

Almost surely, 2^13720256 is an apocalyptic number.

13720256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13720256 is an abundant number, since it is smaller than the sum of its proper divisors (15982504).

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

13720256 is a wasteful number, since it uses less digits than its factorization.

13720256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19512 (or 19502 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 13720256 is about 3704.0863920810. The cubic root of 13720256 is about 239.3981214841.

Adding to 13720256 its reverse (65202731), we get a palindrome (78922987).

The spelling of 13720256 in words is "thirteen million, seven hundred twenty thousand, two hundred fifty-six".