820276869 has 4 divisors (see below), whose sum is σ = 1093702496. Its totient is φ = 546851244.

The previous prime is 820276819. The next prime is 820276883. The reversal of 820276869 is 968672028.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 820276869 - 2⁹ = 820276357 is a prime.

It is a super-2 number, since 2×820276869² = 1345708283632886322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820276819) 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, 136712809 + ... + 136712814.

It is an arithmetic number, because the mean of its divisors is an integer number (273425624).

Almost surely, 2^820276869 is an apocalyptic number.

It is an amenable number.

820276869 is a deficient number, since it is larger than the sum of its proper divisors (273425627).

820276869 is a wasteful number, since it uses less digits than its factorization.

820276869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273425626.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 820276869 is about 28640.4760609875. The cubic root of 820276869 is about 936.0954946309.

The spelling of 820276869 in words is "eight hundred twenty million, two hundred seventy-six thousand, eight hundred sixty-nine".