813689645 has 8 divisors (see below), whose sum is σ = 999135456. Its totient is φ = 635813136.

The previous prime is 813689621. The next prime is 813689659. The reversal of 813689645 is 546986318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 813689645 - 2⁸ = 813689389 is a prime.

It is a super-3 number, since 3×813689645³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 813689593 and 813689602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1892087 + ... + 1892516.

It is an arithmetic number, because the mean of its divisors is an integer number (124891932).

Almost surely, 2^813689645 is an apocalyptic number.

It is an amenable number.

813689645 is a deficient number, since it is larger than the sum of its proper divisors (185445811).

813689645 is a wasteful number, since it uses less digits than its factorization.

813689645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3784651.

The product of its digits is 1244160, while the sum is 50.

The square root of 813689645 is about 28525.2457482841. The cubic root of 813689645 is about 933.5829889822.

The spelling of 813689645 in words is "eight hundred thirteen million, six hundred eighty-nine thousand, six hundred forty-five".