812149668 has 36 divisors (see below), whose sum is σ = 2239565328. Its totient is φ = 246105840.

The previous prime is 812149627. The next prime is 812149697. The reversal of 812149668 is 866941218.

812149668 is a `hidden beast` number, since 81 + 21 + 496 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 1025046 + ... + 1025837.

It is an arithmetic number, because the mean of its divisors is an integer number (62210148).

Almost surely, 2^812149668 is an apocalyptic number.

It is an amenable number.

812149668 is an abundant number, since it is smaller than the sum of its proper divisors (1427415660).

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

812149668 is a wasteful number, since it uses less digits than its factorization.

812149668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050904 (or 2050899 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 812149668 is about 28498.2397351135. The cubic root of 812149668 is about 932.9936552472.

The spelling of 812149668 in words is "eight hundred twelve million, one hundred forty-nine thousand, six hundred sixty-eight".