25687471 has 4 divisors (see below), whose sum is σ = 25701192. Its totient is φ = 25673752.

The previous prime is 25687433. The next prime is 25687477. The reversal of 25687471 is 17478652.

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

It is a cyclic number.

It is not a de Polignac number, because 25687471 - 2¹⁹ = 25163183 is a prime.

It is a super-3 number, since 3×25687471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25687477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3505 + ... + 7978.

It is an arithmetic number, because the mean of its divisors is an integer number (6425298).

Almost surely, 2^25687471 is an apocalyptic number.

25687471 is a deficient number, since it is larger than the sum of its proper divisors (13721).

25687471 is a wasteful number, since it uses less digits than its factorization.

25687471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13720.

The product of its digits is 94080, while the sum is 40.

The square root of 25687471 is about 5068.2808722485. The cubic root of 25687471 is about 295.0578111348.

The spelling of 25687471 in words is "twenty-five million, six hundred eighty-seven thousand, four hundred seventy-one".