2500000857 has 6 divisors (see below), whose sum is σ = 3611112362. Its totient is φ = 1666667232.

The previous prime is 2500000849. The next prime is 2500000873. The reversal of 2500000857 is 7580000052.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1687237776 + 812763081 = 41076^2 + 28509^2 .

It is not a de Polignac number, because 2500000857 - 2³ = 2500000849 is a prime.

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 2500000857.

It is not an unprimeable number, because it can be changed into a prime (2500000817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138888928 + ... + 138888945.

Almost surely, 2^2500000857 is an apocalyptic number.

It is an amenable number.

2500000857 is a deficient number, since it is larger than the sum of its proper divisors (1111111505).

2500000857 is a wasteful number, since it uses less digits than its factorization.

2500000857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277777879 (or 277777876 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 2500000857 is about 50000.0085699993. The cubic root of 2500000857 is about 1357.2089633812.

The spelling of 2500000857 in words is "two billion, five hundred million, eight hundred fifty-seven", and thus it is an aban number.