2738781391 has 4 divisors (see below), whose sum is σ = 2882927800. Its totient is φ = 2594634984.

The previous prime is 2738781377. The next prime is 2738781407. The reversal of 2738781391 is 1931878372.

It is a happy number.

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

It is not a de Polignac number, because 2738781391 - 2⁵ = 2738781359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2738781301) 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, 72073176 + ... + 72073213.

It is an arithmetic number, because the mean of its divisors is an integer number (720731950).

Almost surely, 2^2738781391 is an apocalyptic number.

2738781391 is a deficient number, since it is larger than the sum of its proper divisors (144146409).

2738781391 is a wasteful number, since it uses less digits than its factorization.

2738781391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144146408.

The product of its digits is 508032, while the sum is 49.

The square root of 2738781391 is about 52333.3678545534. The cubic root of 2738781391 is about 1399.1119182323. Note that the first 3 decimals are identical.

The spelling of 2738781391 in words is "two billion, seven hundred thirty-eight million, seven hundred eighty-one thousand, three hundred ninety-one".