25457813 has 8 divisors (see below), whose sum is σ = 26266968. Its totient is φ = 24655104.

The previous prime is 25457807. The next prime is 25457819. The reversal of 25457813 is 31875452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25457807) and next prime (25457819).

It can be written as a sum of positive squares in 4 ways, for example, as 8868484 + 16589329 = 2978^2 + 4073^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25457813 - 2⁴ = 25457797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25457819) 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 in 7 ways as a sum of consecutive naturals, for example, 7145 + ... + 10097.

It is an arithmetic number, because the mean of its divisors is an integer number (3283371).

Almost surely, 2^25457813 is an apocalyptic number.

It is an amenable number.

25457813 is a deficient number, since it is larger than the sum of its proper divisors (809155).

25457813 is a wasteful number, since it uses less digits than its factorization.

25457813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223.

The product of its digits is 33600, while the sum is 35.

The square root of 25457813 is about 5045.5736046559. The cubic root of 25457813 is about 294.1758592770.

The spelling of 25457813 in words is "twenty-five million, four hundred fifty-seven thousand, eight hundred thirteen".