13328649 has 18 divisors (see below), whose sum is σ = 19755918. Its totient is φ = 8659200.

The previous prime is 13328641. The next prime is 13328657. The reversal of 13328649 is 94682331.

13328649 is a `hidden beast` number, since 1 + 3 + 3 + 2 + 8 + 649 = 666.

It is an interprime number because it is at equal distance from previous prime (13328641) and next prime (13328657).

It can be written as a sum of positive squares in 3 ways, for example, as 1550025 + 11778624 = 1245^2 + 3432^2 .

It is not a de Polignac number, because 13328649 - 2³ = 13328641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13328641) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14689 + ... + 15569.

It is an arithmetic number, because the mean of its divisors is an integer number (1097551).

Almost surely, 2^13328649 is an apocalyptic number.

It is an amenable number.

13328649 is a deficient number, since it is larger than the sum of its proper divisors (6427269).

13328649 is an equidigital number, since it uses as much as digits as its factorization.

13328649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969 (or 925 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 13328649 is about 3650.8422315953. The cubic root of 13328649 is about 237.0984475902.

It can be divided in two parts, 133 and 28649, that added together give a palindrome (28782).

The spelling of 13328649 in words is "thirteen million, three hundred twenty-eight thousand, six hundred forty-nine".