802785865 has 12 divisors (see below), whose sum is σ = 1120623876. Its totient is φ = 550481568.

The previous prime is 802785847. The next prime is 802785869. The reversal of 802785865 is 568587208.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 217533001 + 585252864 = 14749^2 + 24192^2 .

It is not a de Polignac number, because 802785865 - 2⁵ = 802785833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (802785869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1638094 + ... + 1638583.

It is an arithmetic number, because the mean of its divisors is an integer number (93385323).

Almost surely, 2^802785865 is an apocalyptic number.

It is an amenable number.

802785865 is a deficient number, since it is larger than the sum of its proper divisors (317838011).

802785865 is a wasteful number, since it uses less digits than its factorization.

802785865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276696 (or 3276689 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 49.

The square root of 802785865 is about 28333.4760486602. The cubic root of 802785865 is about 929.3940883079.

The spelling of 802785865 in words is "eight hundred two million, seven hundred eighty-five thousand, eight hundred sixty-five".