2278326781 has 4 divisors (see below), whose sum is σ = 2278446912. Its totient is φ = 2278206652.

The previous prime is 2278326779. The next prime is 2278326823. The reversal of 2278326781 is 1876238722.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2278326781 - 2¹ = 2278326779 is a prime.

It is a super-2 number, since 2×2278326781² = 10381545842043643922, 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 (2278326751) 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, 24661 + ... + 71866.

It is an arithmetic number, because the mean of its divisors is an integer number (569611728).

Almost surely, 2^2278326781 is an apocalyptic number.

It is an amenable number.

2278326781 is a deficient number, since it is larger than the sum of its proper divisors (120131).

2278326781 is an equidigital number, since it uses as much as digits as its factorization.

2278326781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120130.

The product of its digits is 451584, while the sum is 46.

The square root of 2278326781 is about 47731.8214716346. The cubic root of 2278326781 is about 1315.8468295245.

The spelling of 2278326781 in words is "two billion, two hundred seventy-eight million, three hundred twenty-six thousand, seven hundred eighty-one".