805780831 has 16 divisors (see below), whose sum is σ = 846655488. Its totient is φ = 766065600.

The previous prime is 805780819. The next prime is 805780901. The reversal of 805780831 is 138087508.

It is a cyclic number.

It is not a de Polignac number, because 805780831 - 2⁹ = 805780319 is a prime.

It is a super-2 number, since 2×805780831² = 1298565495214101122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805786831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 521446 + ... + 522988.

It is an arithmetic number, because the mean of its divisors is an integer number (52915968).

Almost surely, 2^805780831 is an apocalyptic number.

805780831 is a deficient number, since it is larger than the sum of its proper divisors (40874657).

805780831 is a wasteful number, since it uses less digits than its factorization.

805780831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 805780831 is about 28386.2789213380. The cubic root of 805780831 is about 930.5484224360.

It can be divided in two parts, 8057 and 80831, that added together give a palindrome (88888).

The spelling of 805780831 in words is "eight hundred five million, seven hundred eighty thousand, eight hundred thirty-one".