813866769 has 24 divisors (see below), whose sum is σ = 1219545600. Its totient is φ = 522624960.

The previous prime is 813866743. The next prime is 813866791. The reversal of 813866769 is 967668318.

It is a happy number.

It is not a de Polignac number, because 813866769 - 2⁵ = 813866737 is a prime.

It is a super-2 number, since 2×813866769² = 1324758235364998722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (813866069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15192 + ... + 43110.

It is an arithmetic number, because the mean of its divisors is an integer number (50814400).

Almost surely, 2^813866769 is an apocalyptic number.

It is an amenable number.

813866769 is a deficient number, since it is larger than the sum of its proper divisors (405678831).

813866769 is a wasteful number, since it uses less digits than its factorization.

813866769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28045 (or 28042 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 813866769 is about 28528.3502677600. The cubic root of 813866769 is about 933.6507248638.

The spelling of 813866769 in words is "eight hundred thirteen million, eight hundred sixty-six thousand, seven hundred sixty-nine".