2725607781 has 12 divisors (see below), whose sum is σ = 4239834508. Its totient is φ = 1677297024.

The previous prime is 2725607767. The next prime is 2725607861. The reversal of 2725607781 is 1877065272.

2725607781 is a `hidden beast` number, since 2 + 7 + 2 + 560 + 7 + 7 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1659258756 + 1066349025 = 40734^2 + 32655^2 .

It is not a de Polignac number, because 2725607781 - 2⁷ = 2725607653 is a prime.

It is a super-2 number, since 2×2725607781² = 14857875551695487922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2725607081) 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 11 ways as a sum of consecutive naturals, for example, 11647780 + ... + 11648013.

Almost surely, 2^2725607781 is an apocalyptic number.

It is an amenable number.

2725607781 is a deficient number, since it is larger than the sum of its proper divisors (1514226727).

2725607781 is a wasteful number, since it uses less digits than its factorization.

2725607781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23295812 (or 23295809 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 2725607781 is about 52207.3537061591. The cubic root of 2725607781 is about 1396.8650569327.

The spelling of 2725607781 in words is "two billion, seven hundred twenty-five million, six hundred seven thousand, seven hundred eighty-one".