813636 has 36 divisors (see below), whose sum is σ = 2086812. Its totient is φ = 267264.

The previous prime is 813623. The next prime is 813647. The reversal of 813636 is 636318.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 553536 = 510^2 + 744^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813636.

It is an unprimeable number.

813636 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3376 + ... + 3608.

It is an arithmetic number, because the mean of its divisors is an integer number (57967).

2⁸¹³⁶³⁶ is an apocalyptic number.

It is an amenable number.

813636 is an abundant number, since it is smaller than the sum of its proper divisors (1273176).

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

813636 is a wasteful number, since it uses less digits than its factorization.

813636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 335 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 813636 is about 902.0177381848. The cubic root of 813636 is about 93.3562472085.

The spelling of 813636 in words is "eight hundred thirteen thousand, six hundred thirty-six".