13680388 has 12 divisors (see below), whose sum is σ = 24524892. Its totient is φ = 6673280.

The previous prime is 13680383. The next prime is 13680397. The reversal of 13680388 is 88308631.

It can be written as a sum of positive squares in 2 ways, for example, as 777924 + 12902464 = 882^2 + 3592^2 .

It is not an unprimeable number, because it can be changed into a prime (13680383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41545 + ... + 41872.

It is an arithmetic number, because the mean of its divisors is an integer number (2043741).

Almost surely, 2^13680388 is an apocalyptic number.

It is an amenable number.

13680388 is a deficient number, since it is larger than the sum of its proper divisors (10844504).

13680388 is a wasteful number, since it uses less digits than its factorization.

13680388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83462 (or 83460 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 13680388 is about 3698.7008530023. The cubic root of 13680388 is about 239.1660173645.

The spelling of 13680388 in words is "thirteen million, six hundred eighty thousand, three hundred eighty-eight".