906826781 has 12 divisors (see below), whose sum is σ = 1091257020. Its totient is φ = 750476160.

The previous prime is 906826777. The next prime is 906826799. The reversal of 906826781 is 187628609.

It can be written as a sum of positive squares in 2 ways, for example, as 165353881 + 741472900 = 12859^2 + 27230^2 .

It is not a de Polignac number, because 906826781 - 2² = 906826777 is a prime.

It is a super-2 number, since 2×906826781² = 1644669621477643922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906826181) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 317660 + ... + 320501.

It is an arithmetic number, because the mean of its divisors is an integer number (90938085).

Almost surely, 2^906826781 is an apocalyptic number.

It is an amenable number.

906826781 is a deficient number, since it is larger than the sum of its proper divisors (184430239).

906826781 is a wasteful number, since it uses less digits than its factorization.

906826781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638204 (or 638197 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 906826781 is about 30113.5647341858. The cubic root of 906826781 is about 967.9244175926.

The spelling of 906826781 in words is "nine hundred six million, eight hundred twenty-six thousand, seven hundred eighty-one".