2684091781 has 8 divisors (see below), whose sum is σ = 3173310720. Its totient is φ = 2221317168.

The previous prime is 2684091769. The next prime is 2684091797. The reversal of 2684091781 is 1871904862.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2684091781 - 2⁹ = 2684091269 is a prime.

It is a super-2 number, since 2×2684091781² = 14408697377663503922, 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 (2684091701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6610861 + ... + 6611266.

It is an arithmetic number, because the mean of its divisors is an integer number (396663840).

Almost surely, 2^2684091781 is an apocalyptic number.

It is an amenable number.

2684091781 is a deficient number, since it is larger than the sum of its proper divisors (489218939).

2684091781 is a wasteful number, since it uses less digits than its factorization.

2684091781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13222163.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 2684091781 is about 51808.2211719337. The cubic root of 2684091781 is about 1389.7364683360.

The spelling of 2684091781 in words is "two billion, six hundred eighty-four million, ninety-one thousand, seven hundred eighty-one".