820530572 has 12 divisors (see below), whose sum is σ = 1436476776. Its totient is φ = 410108640.

The previous prime is 820530569. The next prime is 820530583. The reversal of 820530572 is 275035028.

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, 26954 + ... + 48657.

It is an arithmetic number, because the mean of its divisors is an integer number (119706398).

Almost surely, 2^820530572 is an apocalyptic number.

It is an amenable number.

820530572 is a deficient number, since it is larger than the sum of its proper divisors (615946204).

820530572 is a wasteful number, since it uses less digits than its factorization.

820530572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78328 (or 78326 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 820530572 is about 28644.9048174366. The cubic root of 820530572 is about 936.1919928435.

The spelling of 820530572 in words is "eight hundred twenty million, five hundred thirty thousand, five hundred seventy-two".