812573856 has 120 divisors (see below), whose sum is σ = 2425943520. Its totient is φ = 266758272.

The previous prime is 812573843. The next prime is 812573869. The reversal of 812573856 is 658375218.

It is an interprime number because it is at equal distance from previous prime (812573843) and next prime (812573869).

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 19 ways as a sum of consecutive naturals, for example, 171325 + ... + 176003.

It is an arithmetic number, because the mean of its divisors is an integer number (20216196).

Almost surely, 2^812573856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812573856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1212971760).

812573856 is an abundant number, since it is smaller than the sum of its proper divisors (1613369664).

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

812573856 is a wasteful number, since it uses less digits than its factorization.

812573856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4768 (or 4751 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 812573856 is about 28505.6811179807. The cubic root of 812573856 is about 933.1560620240.

The spelling of 812573856 in words is "eight hundred twelve million, five hundred seventy-three thousand, eight hundred fifty-six".