806881140 has 72 divisors (see below), whose sum is σ = 2635819368. Its totient is φ = 198616320.

The previous prime is 806881129. The next prime is 806881177. The reversal of 806881140 is 41188608.

It can be written as a sum of positive squares in 4 ways, for example, as 34152336 + 772728804 = 5844^2 + 27798^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 806881095 and 806881104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170071 + ... + 174750.

Almost surely, 2^806881140 is an apocalyptic number.

It is an amenable number.

806881140 is an abundant number, since it is smaller than the sum of its proper divisors (1828938228).

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

806881140 is a wasteful number, since it uses less digits than its factorization.

806881140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344849 (or 344844 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 806881140 is about 28405.6533105648. The cubic root of 806881140 is about 930.9717902926.

The spelling of 806881140 in words is "eight hundred six million, eight hundred eighty-one thousand, one hundred forty".