8255404840 has 32 divisors (see below), whose sum is σ = 18739048680. Its totient is φ = 3272937472.

The previous prime is 8255404793. The next prime is 8255404841. The reversal of 8255404840 is 484045528.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5631301764 + 2624103076 = 75042^2 + 51226^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 8255404793 and 8255404802.

It is not an unprimeable number, because it can be changed into a prime (8255404841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 908689 + ... + 917728.

Almost surely, 2^8255404840 is an apocalyptic number.

It is an amenable number.

8255404840 is an abundant number, since it is smaller than the sum of its proper divisors (10483643840).

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

8255404840 is a wasteful number, since it uses less digits than its factorization.

8255404840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826541 (or 1826537 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 40.

The square root of 8255404840 is about 90859.2584165202. The cubic root of 8255404840 is about 2021.0611716766.

The spelling of 8255404840 in words is "eight billion, two hundred fifty-five million, four hundred four thousand, eight hundred forty".