25707457 has 2 divisors, whose sum is σ = 25707458. Its totient is φ = 25707456.

The previous prime is 25707397. The next prime is 25707503. The reversal of 25707457 is 75470752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24245776 + 1461681 = 4924^2 + 1209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25707457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25704457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12853728 + 12853729.

It is an arithmetic number, because the mean of its divisors is an integer number (12853729).

Almost surely, 2^25707457 is an apocalyptic number.

It is an amenable number.

25707457 is a deficient number, since it is larger than the sum of its proper divisors (1).

25707457 is an equidigital number, since it uses as much as digits as its factorization.

25707457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68600, while the sum is 37.

The square root of 25707457 is about 5070.2521633544. The cubic root of 25707457 is about 295.1343140169.

It can be divided in two parts, 2570745 and 7, that added together give a palindrome (2570752).

The spelling of 25707457 in words is "twenty-five million, seven hundred seven thousand, four hundred fifty-seven".