2780725281 has 4 divisors (see below), whose sum is σ = 3707633712. Its totient is φ = 1853816852.

The previous prime is 2780725273. The next prime is 2780725289. The reversal of 2780725281 is 1825270872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2780725273) and next prime (2780725289).

It is a cyclic number.

It is not a de Polignac number, because 2780725281 - 2³ = 2780725273 is a prime.

It is a super-2 number, since 2×2780725281² = 15464866176785057922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2780725289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463454211 + ... + 463454216.

It is an arithmetic number, because the mean of its divisors is an integer number (926908428).

Almost surely, 2^2780725281 is an apocalyptic number.

It is an amenable number.

2780725281 is a deficient number, since it is larger than the sum of its proper divisors (926908431).

2780725281 is an equidigital number, since it uses as much as digits as its factorization.

2780725281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926908430.

The product of its (nonzero) digits is 125440, while the sum is 42.

The square root of 2780725281 is about 52732.5827264321. The cubic root of 2780725281 is about 1406.2181371783.

The spelling of 2780725281 in words is "two billion, seven hundred eighty million, seven hundred twenty-five thousand, two hundred eighty-one".