2771990405 has 4 divisors (see below), whose sum is σ = 3326388492. Its totient is φ = 2217592320.

The previous prime is 2771990401. The next prime is 2771990453. The reversal of 2771990405 is 5040991772.

2771990405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 410710756 + 2361279649 = 20266^2 + 48593^2 .

It is not a de Polignac number, because 2771990405 - 2² = 2771990401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2771990401) 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, 277199036 + ... + 277199045.

It is an arithmetic number, because the mean of its divisors is an integer number (831597123).

Almost surely, 2^2771990405 is an apocalyptic number.

It is an amenable number.

2771990405 is a deficient number, since it is larger than the sum of its proper divisors (554398087).

2771990405 is an equidigital number, since it uses as much as digits as its factorization.

2771990405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554398086.

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 2771990405 is about 52649.6952032963. The cubic root of 2771990405 is about 1404.7441782090.

The spelling of 2771990405 in words is "two billion, seven hundred seventy-one million, nine hundred ninety thousand, four hundred five".