813875265 has 48 divisors (see below), whose sum is σ = 1646581248. Its totient is φ = 364134528.

The previous prime is 813875207. The next prime is 813875267. The reversal of 813875265 is 562578318.

813875265 is a `hidden beast` number, since 8 + 1 + 387 + 5 + 265 = 666.

It is not a de Polignac number, because 813875265 - 2²⁶ = 746766401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 813875265.

It is not an unprimeable number, because it can be changed into a prime (813875267) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12682 + ... + 42291.

It is an arithmetic number, because the mean of its divisors is an integer number (34303776).

Almost surely, 2^813875265 is an apocalyptic number.

It is an amenable number.

813875265 is an abundant number, since it is smaller than the sum of its proper divisors (832705983).

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

813875265 is a wasteful number, since it uses less digits than its factorization.

813875265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55038 (or 55035 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 813875265 is about 28528.4991718807. The cubic root of 813875265 is about 933.6539736629.

The spelling of 813875265 in words is "eight hundred thirteen million, eight hundred seventy-five thousand, two hundred sixty-five".