13566690 has 56 divisors (see below), whose sum is σ = 36632988. Its totient is φ = 3615840.

The previous prime is 13566689. The next prime is 13566701. The reversal of 13566690 is 9666531.

It can be written as a sum of positive squares in 2 ways, for example, as 11029041 + 2537649 = 3321^2 + 1593^2 .

It is a super-2 number, since 2×13566690² = 368110155112200, which contains 22 as substring.

It is an unprimeable number.

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 27 ways as a sum of consecutive naturals, for example, 6360 + ... + 8220.

Almost surely, 2^13566690 is an apocalyptic number.

13566690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13566690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18316494).

13566690 is an abundant number, since it is smaller than the sum of its proper divisors (23066298).

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

13566690 is an equidigital number, since it uses as much as digits as its factorization.

13566690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886 (or 1871 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 13566690 is about 3683.2987932016. The cubic root of 13566690 is about 238.5016019828.

The spelling of 13566690 in words is "thirteen million, five hundred sixty-six thousand, six hundred ninety".