2628649257 has 16 divisors (see below), whose sum is σ = 3830809920. Its totient is φ = 1593484992.

The previous prime is 2628649253. The next prime is 2628649267. The reversal of 2628649257 is 7529468262.

It is a happy number.

It is not a de Polignac number, because 2628649257 - 2² = 2628649253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2628649253) 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 15 ways as a sum of consecutive naturals, for example, 500382 + ... + 505607.

It is an arithmetic number, because the mean of its divisors is an integer number (239425620).

Almost surely, 2^2628649257 is an apocalyptic number.

It is an amenable number.

2628649257 is a deficient number, since it is larger than the sum of its proper divisors (1202160663).

2628649257 is a wasteful number, since it uses less digits than its factorization.

2628649257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006072.

The product of its digits is 2903040, while the sum is 51.

The square root of 2628649257 is about 51270.3545628465. The cubic root of 2628649257 is about 1380.1010317756.

The spelling of 2628649257 in words is "two billion, six hundred twenty-eight million, six hundred forty-nine thousand, two hundred fifty-seven".