805911640 has 32 divisors (see below), whose sum is σ = 1847519280. Its totient is φ = 316281472.

The previous prime is 805911637. The next prime is 805911641. The reversal of 805911640 is 46119508.

It is a junction number, because it is equal to n+sod(n) for n = 805911596 and 805911605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805911641) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 187954 + ... + 192193.

Almost surely, 2^805911640 is an apocalyptic number.

It is an amenable number.

805911640 is an abundant number, since it is smaller than the sum of its proper divisors (1041607640).

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

805911640 is a wasteful number, since it uses less digits than its factorization.

805911640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380211 (or 380207 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 805911640 is about 28388.5829163768. The cubic root of 805911640 is about 930.5987742263.

The spelling of 805911640 in words is "eight hundred five million, nine hundred eleven thousand, six hundred forty".