2271532778 has 4 divisors (see below), whose sum is σ = 3407299170. Its totient is φ = 1135766388.

The previous prime is 2271532771. The next prime is 2271532787. The reversal of 2271532778 is 8772351722.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8772351722 = 2 ⋅4386175861.

It can be written as a sum of positive squares in only one way, i.e., 1792929649 + 478603129 = 42343^2 + 21877^2 .

It is a super-2 number, since 2×2271532778² = 10319722323056794568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2271532771) 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 as a sum of consecutive naturals, namely, 567883193 + ... + 567883196.

Almost surely, 2^2271532778 is an apocalyptic number.

2271532778 is a deficient number, since it is larger than the sum of its proper divisors (1135766392).

2271532778 is a wasteful number, since it uses less digits than its factorization.

2271532778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135766391.

The product of its digits is 329280, while the sum is 44.

The square root of 2271532778 is about 47660.5998493515. The cubic root of 2271532778 is about 1314.5375692370.

The spelling of 2271532778 in words is "two billion, two hundred seventy-one million, five hundred thirty-two thousand, seven hundred seventy-eight".