2813531778 has 24 divisors (see below), whose sum is σ = 6099020928. Its totient is φ = 937376952.

The previous prime is 2813531767. The next prime is 2813531779. The reversal of 2813531778 is 8771353182.

2813531778 is a `hidden beast` number, since 281 + 353 + 17 + 7 + 8 = 666.

It is a super-2 number, since 2×2813531778² = 15831922131631682568, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2813531779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 750 + ... + 75017.

It is an arithmetic number, because the mean of its divisors is an integer number (254125872).

Almost surely, 2^2813531778 is an apocalyptic number.

2813531778 is an abundant number, since it is smaller than the sum of its proper divisors (3285489150).

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

2813531778 is a wasteful number, since it uses less digits than its factorization.

2813531778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77838 (or 77835 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 2813531778 is about 53042.7353932657. The cubic root of 2813531778 is about 1411.7266338219.

The spelling of 2813531778 in words is "two billion, eight hundred thirteen million, five hundred thirty-one thousand, seven hundred seventy-eight".