2805825640 has 16 divisors (see below), whose sum is σ = 6313107780. Its totient is φ = 1122330240.

The previous prime is 2805825613. The next prime is 2805825647. The reversal of 2805825640 is 465285082.

It can be written as a sum of positive squares in 2 ways, for example, as 2565017316 + 240808324 = 50646^2 + 15518^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 70145641 = 2805825640 / (2 + 8 + 0 + 5 + 8 + 2 + 5 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 2805825593 and 2805825602.

It is not an unprimeable number, because it can be changed into a prime (2805825647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35072781 + ... + 35072860.

Almost surely, 2^2805825640 is an apocalyptic number.

2805825640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2805825640 is an abundant number, since it is smaller than the sum of its proper divisors (3507282140).

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

2805825640 is a wasteful number, since it uses less digits than its factorization.

2805825640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70145652 (or 70145648 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 40.

The square root of 2805825640 is about 52970.0447422881. The cubic root of 2805825640 is about 1410.4365698753.

The spelling of 2805825640 in words is "two billion, eight hundred five million, eight hundred twenty-five thousand, six hundred forty".