2787327661 has 4 divisors (see below), whose sum is σ = 2792423872. Its totient is φ = 2782231452.

The previous prime is 2787327659. The next prime is 2787327709. The reversal of 2787327661 is 1667237872.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2787327661 - 2¹ = 2787327659 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 (2787327161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2547285 + ... + 2548378.

It is an arithmetic number, because the mean of its divisors is an integer number (698105968).

Almost surely, 2^2787327661 is an apocalyptic number.

It is an amenable number.

2787327661 is a deficient number, since it is larger than the sum of its proper divisors (5096211).

2787327661 is an equidigital number, since it uses as much as digits as its factorization.

2787327661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096210.

The product of its digits is 1185408, while the sum is 49.

The square root of 2787327661 is about 52795.1480819971. The cubic root of 2787327661 is about 1407.3302029352.

The spelling of 2787327661 in words is "two billion, seven hundred eighty-seven million, three hundred twenty-seven thousand, six hundred sixty-one".