820734867 has 12 divisors (see below), whose sum is σ = 1185835560. Its totient is φ = 547004448.

The previous prime is 820734853. The next prime is 820734881. The reversal of 820734867 is 768437028.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (820734853) and next prime (820734881).

It is not a de Polignac number, because 820734867 - 2²³ = 812346259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820734847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28543 + ... + 49559.

It is an arithmetic number, because the mean of its divisors is an integer number (98819630).

Almost surely, 2^820734867 is an apocalyptic number.

820734867 is a deficient number, since it is larger than the sum of its proper divisors (365100693).

820734867 is a wasteful number, since it uses less digits than its factorization.

820734867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25362 (or 25359 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 820734867 is about 28648.4705874502. The cubic root of 820734867 is about 936.2696838232.

The spelling of 820734867 in words is "eight hundred twenty million, seven hundred thirty-four thousand, eight hundred sixty-seven".