2780725257 has 12 divisors (see below), whose sum is σ = 4034300400. Its totient is φ = 1845648888.

The previous prime is 2780725253. The next prime is 2780725267. The reversal of 2780725257 is 7525270872.

It is not a de Polignac number, because 2780725257 - 2² = 2780725253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2780725253) 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 11 ways as a sum of consecutive naturals, for example, 678507 + ... + 682592.

It is an arithmetic number, because the mean of its divisors is an integer number (336191700).

Almost surely, 2^2780725257 is an apocalyptic number.

It is an amenable number.

2780725257 is a deficient number, since it is larger than the sum of its proper divisors (1253575143).

2780725257 is a wasteful number, since it uses less digits than its factorization.

2780725257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361332 (or 1361329 counting only the distinct ones).

The product of its (nonzero) digits is 548800, while the sum is 45.

The square root of 2780725257 is about 52732.5824988688. The cubic root of 2780725257 is about 1406.2181331327.

The spelling of 2780725257 in words is "two billion, seven hundred eighty million, seven hundred twenty-five thousand, two hundred fifty-seven".