13309056 has 64 divisors (see below), whose sum is σ = 39290400. Its totient is φ = 4435200.

The previous prime is 13309031. The next prime is 13309061. The reversal of 13309056 is 65090331.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×13309056² = 354261943222272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1531 + ... + 5381.

Almost surely, 2^13309056 is an apocalyptic number.

13309056 is a gapful number since it is divisible by the number (16) 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 13309056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19645200).

13309056 is an abundant number, since it is smaller than the sum of its proper divisors (25981344).

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

13309056 is an equidigital number, since it uses as much as digits as its factorization.

13309056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874 (or 3856 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 27.

The square root of 13309056 is about 3648.1578913199. The cubic root of 13309056 is about 236.9822130538.

Adding to 13309056 its reverse (65090331), we get a palindrome (78399387).

The spelling of 13309056 in words is "thirteen million, three hundred nine thousand, fifty-six".