812530320 has 80 divisors (see below), whose sum is σ = 2878684800. Its totient is φ = 185720832.

The previous prime is 812530291. The next prime is 812530343. The reversal of 812530320 is 23035218.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 15 ways as a sum of consecutive naturals, for example, 240145 + ... + 243504.

It is an arithmetic number, because the mean of its divisors is an integer number (35983560).

Almost surely, 2^812530320 is an apocalyptic number.

812530320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

812530320 is an abundant number, since it is smaller than the sum of its proper divisors (2066154480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812530320 is a wasteful number, since it uses less digits than its factorization.

812530320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483672 (or 483666 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 812530320 is about 28504.9174704997. The cubic root of 812530320 is about 933.1393962126.

Adding to 812530320 its reverse (23035218), we get a palindrome (835565538).

The spelling of 812530320 in words is "eight hundred twelve million, five hundred thirty thousand, three hundred twenty".