25791457 has 4 divisors (see below), whose sum is σ = 25814980. Its totient is φ = 25767936.

The previous prime is 25791439. The next prime is 25791463. The reversal of 25791457 is 75419752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16329681 + 9461776 = 4041^2 + 3076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25791457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25791407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10032 + ... + 12337.

It is an arithmetic number, because the mean of its divisors is an integer number (6453745).

Almost surely, 2^25791457 is an apocalyptic number.

It is an amenable number.

25791457 is a deficient number, since it is larger than the sum of its proper divisors (23523).

25791457 is a wasteful number, since it uses less digits than its factorization.

25791457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23522.

The product of its digits is 88200, while the sum is 40.

The square root of 25791457 is about 5078.5290193126. The cubic root of 25791457 is about 295.4554183715.

The spelling of 25791457 in words is "twenty-five million, seven hundred ninety-one thousand, four hundred fifty-seven".