2809800640 has 56 divisors (see below), whose sum is σ = 6698693232. Its totient is φ = 1122600960.

The previous prime is 2809800607. The next prime is 2809800667. The reversal of 2809800640 is 460089082.

2809800640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2809800640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295155 + ... + 304525.

It is an arithmetic number, because the mean of its divisors is an integer number (119619522).

Almost surely, 2^2809800640 is an apocalyptic number.

2809800640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2809800640 is an abundant number, since it is smaller than the sum of its proper divisors (3888892592).

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

2809800640 is an equidigital number, since it uses as much as digits as its factorization.

2809800640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10325 (or 10315 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 2809800640 is about 53007.5526694074. The cubic root of 2809800640 is about 1411.1023085450.

The spelling of 2809800640 in words is "two billion, eight hundred nine million, eight hundred thousand, six hundred forty".