812763081 has 81 divisors (see below), whose sum is σ = 1382558229. Its totient is φ = 459793152.

The previous prime is 812763037. The next prime is 812763143. The reversal of 812763081 is 180367218.

The square root of 812763081 is 28509.

It is a perfect power (a square), and thus also a powerful number.

812763081 is a `hidden beast` number, since 8 + 12 + 7 + 630 + 8 + 1 = 666.

812763081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7338681 + 805424400 = 2709^2 + 28380^2 .

It is not a de Polignac number, because 812763081 - 2⁷ = 812762953 is a prime.

It is a super-2 number, since 2×812763081² = 1321167651673225122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (812763181) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 18901446 + ... + 18901488.

Almost surely, 2^812763081 is an apocalyptic number.

812763081 is the 28509-th square number.

812763081 is the 14255-th centered octagonal number.

It is an amenable number.

812763081 is a deficient number, since it is larger than the sum of its proper divisors (569795148).

812763081 is a wasteful number, since it uses less digits than its factorization.

812763081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The cubic root of 812763081 is about 933.2284914406.

Multiplying 812763081 by its sum of digits (36), we get a square (29259470916 = 171054²).

The spelling of 812763081 in words is "eight hundred twelve million, seven hundred sixty-three thousand, eighty-one".