2891348378 has 4 divisors (see below), whose sum is σ = 4337022570. Its totient is φ = 1445674188.

The previous prime is 2891348371. The next prime is 2891348417. The reversal of 2891348378 is 8738431982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1977314089 + 914034289 = 44467^2 + 30233^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2891348371) 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, 722837093 + ... + 722837096.

Almost surely, 2^2891348378 is an apocalyptic number.

2891348378 is a deficient number, since it is larger than the sum of its proper divisors (1445674192).

2891348378 is a wasteful number, since it uses less digits than its factorization.

2891348378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445674191.

The product of its digits is 2322432, while the sum is 53.

The square root of 2891348378 is about 53771.2597769478. The cubic root of 2891348378 is about 1424.6236212090.

The spelling of 2891348378 in words is "two billion, eight hundred ninety-one million, three hundred forty-eight thousand, three hundred seventy-eight".