820724834 has 8 divisors (see below), whose sum is σ = 1233507420. Its totient is φ = 409555696.

The previous prime is 820724819. The next prime is 820724843. The reversal of 820724834 is 438427028.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 780364225 + 40360609 = 27935^2 + 6353^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402089 + ... + 404124.

Almost surely, 2^820724834 is an apocalyptic number.

820724834 is a deficient number, since it is larger than the sum of its proper divisors (412782586).

820724834 is a wasteful number, since it uses less digits than its factorization.

820724834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806724.

The product of its (nonzero) digits is 86016, while the sum is 38.

The square root of 820724834 is about 28648.2954815814. The cubic root of 820724834 is about 936.2658686926.

The spelling of 820724834 in words is "eight hundred twenty million, seven hundred twenty-four thousand, eight hundred thirty-four".