2776774813 has 4 divisors (see below), whose sum is σ = 2807974620. Its totient is φ = 2745575008.

The previous prime is 2776774807. The next prime is 2776774901. The reversal of 2776774813 is 3184776772.

It is a happy number.

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 1454507044 + 1322267769 = 38138^2 + 36363^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2776774813 is a prime.

It is a super-2 number, since 2×2776774813² = 15420956724222369938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2776774313) 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, 15599770 + ... + 15599947.

It is an arithmetic number, because the mean of its divisors is an integer number (701993655).

Almost surely, 2^2776774813 is an apocalyptic number.

It is an amenable number.

2776774813 is a deficient number, since it is larger than the sum of its proper divisors (31199807).

2776774813 is an equidigital number, since it uses as much as digits as its factorization.

2776774813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31199806.

The product of its digits is 2765952, while the sum is 52.

The square root of 2776774813 is about 52695.1118511006. Note that the first 3 decimals coincide. The cubic root of 2776774813 is about 1405.5519018184.

The spelling of 2776774813 in words is "two billion, seven hundred seventy-six million, seven hundred seventy-four thousand, eight hundred thirteen".