13087818 has 20 divisors (see below), whose sum is σ = 29326770. Its totient is φ = 4362552.

The previous prime is 13087783. The next prime is 13087819. The reversal of 13087818 is 81878031.

13087818 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12766329 + 321489 = 3573^2 + 567^2 .

It is a super-2 number, since 2×13087818² = 342581960002248, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13087819) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 40233 + ... + 40556.

Almost surely, 2^13087818 is an apocalyptic number.

13087818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13087818 is an abundant number, since it is smaller than the sum of its proper divisors (16238952).

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

13087818 is an equidigital number, since it uses as much as digits as its factorization.

13087818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80803 (or 80794 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 13087818 is about 3617.7089435166. The cubic root of 13087818 is about 235.6617412985.

The spelling of 13087818 in words is "thirteen million, eighty-seven thousand, eight hundred eighteen".