812971776 has 72 divisors (see below), whose sum is σ = 2233552384. Its totient is φ = 262241280.

The previous prime is 812971763. The next prime is 812971793. The reversal of 812971776 is 677179218.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 6735 + ... + 40881.

Almost surely, 2^812971776 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 812971776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1116776192).

812971776 is an abundant number, since it is smaller than the sum of its proper divisors (1420580608).

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

812971776 is a wasteful number, since it uses less digits than its factorization.

812971776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34197 (or 34183 counting only the distinct ones).

The product of its digits is 296352, while the sum is 48.

The square root of 812971776 is about 28512.6599250228. The cubic root of 812971776 is about 933.3083603295.

The spelling of 812971776 in words is "eight hundred twelve million, nine hundred seventy-one thousand, seven hundred seventy-six".