25878857 has 2 divisors, whose sum is σ = 25878858. Its totient is φ = 25878856.

The previous prime is 25878803. The next prime is 25878871. The reversal of 25878857 is 75887852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25441936 + 436921 = 5044^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 25878857 - 2⁶ = 25878793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25808857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12939428 + 12939429.

It is an arithmetic number, because the mean of its divisors is an integer number (12939429).

Almost surely, 2^25878857 is an apocalyptic number.

It is an amenable number.

25878857 is a deficient number, since it is larger than the sum of its proper divisors (1).

25878857 is an equidigital number, since it uses as much as digits as its factorization.

25878857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1254400, while the sum is 50.

The square root of 25878857 is about 5087.1265956333. The cubic root of 25878857 is about 295.7887805595.

The spelling of 25878857 in words is "twenty-five million, eight hundred seventy-eight thousand, eight hundred fifty-seven".