813828773 has 4 divisors (see below), whose sum is σ = 814091340. Its totient is φ = 813566208.

The previous prime is 813828761. The next prime is 813828779. The reversal of 813828773 is 377828318.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 566773249 + 247055524 = 23807^2 + 15718^2 .

It is a cyclic number.

It is not a de Polignac number, because 813828773 - 2²⁴ = 797051557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813828779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126578 + ... + 132851.

It is an arithmetic number, because the mean of its divisors is an integer number (203522835).

Almost surely, 2^813828773 is an apocalyptic number.

It is an amenable number.

813828773 is a deficient number, since it is larger than the sum of its proper divisors (262567).

813828773 is a wasteful number, since it uses less digits than its factorization.

813828773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262566.

The product of its digits is 451584, while the sum is 47.

The square root of 813828773 is about 28527.6843259315. The cubic root of 813828773 is about 933.6361952355.

The spelling of 813828773 in words is "eight hundred thirteen million, eight hundred twenty-eight thousand, seven hundred seventy-three".