13640828 has 6 divisors (see below), whose sum is σ = 23871456. Its totient is φ = 6820412.

The previous prime is 13640813. The next prime is 13640831. The reversal of 13640828 is 82804631.

It is a junction number, because it is equal to n+sod(n) for n = 13640794 and 13640803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1705100 + ... + 1705107.

It is an arithmetic number, because the mean of its divisors is an integer number (3978576).

Almost surely, 2^13640828 is an apocalyptic number.

It is an amenable number.

13640828 is a deficient number, since it is larger than the sum of its proper divisors (10230628).

13640828 is a wasteful number, since it uses less digits than its factorization.

13640828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410211 (or 3410209 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 13640828 is about 3693.3491576075. The cubic root of 13640828 is about 238.9352602087.

The spelling of 13640828 in words is "thirteen million, six hundred forty thousand, eight hundred twenty-eight".