2748000781 has 4 divisors (see below), whose sum is σ = 2754121500. Its totient is φ = 2741880064.

The previous prime is 2748000743. The next prime is 2748000793. The reversal of 2748000781 is 1870008472.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1865376100 + 882624681 = 43190^2 + 29709^2 .

It is a cyclic number.

It is not a de Polignac number, because 2748000781 - 2³¹ = 600517133 is a prime.

It is a super-2 number, since 2×2748000781² = 15103016584753219922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2748000781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2748000721) 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, 3059686 + ... + 3060583.

It is an arithmetic number, because the mean of its divisors is an integer number (688530375).

Almost surely, 2^2748000781 is an apocalyptic number.

It is an amenable number.

2748000781 is a deficient number, since it is larger than the sum of its proper divisors (6120719).

2748000781 is an equidigital number, since it uses as much as digits as its factorization.

2748000781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6120718.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 2748000781 is about 52421.3771375762. The cubic root of 2748000781 is about 1400.6800745204.

The spelling of 2748000781 in words is "two billion, seven hundred forty-eight million, seven hundred eighty-one", and thus it is an aban number.