804913640 has 64 divisors (see below), whose sum is σ = 1866609360. Its totient is φ = 312186880.

The previous prime is 804913639. The next prime is 804913657. The reversal of 804913640 is 46319408.

It is a Cunningham number, because it is equal to 28371²-1.

It can be written as a sum of positive squares in 8 ways, for example, as 106791556 + 698122084 = 10334^2 + 26422^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 804913640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282302 + ... + 285138.

Almost surely, 2^804913640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 804913640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933304680).

804913640 is an abundant number, since it is smaller than the sum of its proper divisors (1061695720).

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

804913640 is a wasteful number, since it uses less digits than its factorization.

804913640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062 (or 3058 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 804913640 is about 28370.9999823764. Note that the first 4 decimals coincide. The cubic root of 804913640 is about 930.2144801500.

The spelling of 804913640 in words is "eight hundred four million, nine hundred thirteen thousand, six hundred forty".