805109772 has 18 divisors (see below), whose sum is σ = 1878818844. Its totient is φ = 268337160.

The previous prime is 805109771. The next prime is 805109801. The reversal of 805109772 is 277901508.

It is a self number, because there is not a number n which added to its sum of digits gives 805109772.

It is not an unprimeable number, because it can be changed into a prime (805109771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 94197 + ... + 102387.

Almost surely, 2^805109772 is an apocalyptic number.

It is an amenable number.

805109772 is an abundant number, since it is smaller than the sum of its proper divisors (1073709072).

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

805109772 is an frugal number, since it uses more digits than its factorization.

805109772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16389 (or 8196 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 805109772 is about 28374.4563295933. The cubic root of 805109772 is about 930.2900286315.

The spelling of 805109772 in words is "eight hundred five million, one hundred nine thousand, seven hundred seventy-two".