13660686 has 24 divisors (see below), whose sum is σ = 31875480. Its totient is φ = 4203216.

The previous prime is 13660663. The next prime is 13660763. The reversal of 13660686 is 68606631.

13660686 = T₄₄₈ + T₄₄₉ + ... + T₅₅₅.

It is a super-2 number, since 2×13660686² = 373228683981192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13660686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28956 + ... + 29423.

It is an arithmetic number, because the mean of its divisors is an integer number (1328145).

Almost surely, 2^13660686 is an apocalyptic number.

13660686 is an abundant number, since it is smaller than the sum of its proper divisors (18214794).

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

13660686 is a wasteful number, since it uses less digits than its factorization.

13660686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58400 (or 58397 counting only the distinct ones).

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

The square root of 13660686 is about 3696.0365257935. The cubic root of 13660686 is about 239.0511494547.

The spelling of 13660686 in words is "thirteen million, six hundred sixty thousand, six hundred eighty-six".