2729678391 has 24 divisors (see below), whose sum is σ = 4341527424. Its totient is φ = 1638882960.

The previous prime is 2729678383. The next prime is 2729678401. The reversal of 2729678391 is 1938769272.

It is not a de Polignac number, because 2729678391 - 2³ = 2729678383 is a prime.

It is a super-2 number, since 2×2729678391² = 14902288236584697762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2729678311) 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 23 ways as a sum of consecutive naturals, for example, 118251 + ... + 139436.

It is an arithmetic number, because the mean of its divisors is an integer number (180896976).

Almost surely, 2^2729678391 is an apocalyptic number.

2729678391 is a deficient number, since it is larger than the sum of its proper divisors (1611849033).

2729678391 is a wasteful number, since it uses less digits than its factorization.

2729678391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257811 (or 257808 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 2729678391 is about 52246.3241864918. The cubic root of 2729678391 is about 1397.5601024668.

The spelling of 2729678391 in words is "two billion, seven hundred twenty-nine million, six hundred seventy-eight thousand, three hundred ninety-one".