2780789445 has 54 divisors (see below), whose sum is σ = 5611976838. Its totient is φ = 1270086048.

The previous prime is 2780789443. The next prime is 2780789491. The reversal of 2780789445 is 5449870872.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2224631556 + 556157889 = 47166^2 + 23583^2 .

It is not a de Polignac number, because 2780789445 - 2¹ = 2780789443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2780789391 and 2780789400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780789443) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 2475654 + ... + 2476776.

It is an arithmetic number, because the mean of its divisors is an integer number (103925497).

Almost surely, 2^2780789445 is an apocalyptic number.

It is an amenable number.

2780789445 is an abundant number, since it is smaller than the sum of its proper divisors (2831187393).

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

2780789445 is an equidigital number, since it uses as much as digits as its factorization.

2780789445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271 (or 1138 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The square root of 2780789445 is about 52733.1911133775. The cubic root of 2780789445 is about 1406.2289530480.

The spelling of 2780789445 in words is "two billion, seven hundred eighty million, seven hundred eighty-nine thousand, four hundred forty-five".