2781909945 has 12 divisors (see below), whose sum is σ = 4821977316. Its totient is φ = 1483685280.

The previous prime is 2781909929. The next prime is 2781909967. The reversal of 2781909945 is 5499091872.

2781909945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 291999744 + 2489910201 = 17088^2 + 49899^2 .

It is not a de Polignac number, because 2781909945 - 2⁴ = 2781909929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2781909891 and 2781909900.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30910066 + ... + 30910155.

It is an arithmetic number, because the mean of its divisors is an integer number (401831443).

Almost surely, 2^2781909945 is an apocalyptic number.

It is an amenable number.

2781909945 is a deficient number, since it is larger than the sum of its proper divisors (2040067371).

2781909945 is a wasteful number, since it uses less digits than its factorization.

2781909945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61820232 (or 61820229 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The square root of 2781909945 is about 52743.8142818663. The cubic root of 2781909945 is about 1406.4178044496.

The spelling of 2781909945 in words is "two billion, seven hundred eighty-one million, nine hundred nine thousand, nine hundred forty-five".