25478831 has 8 divisors (see below), whose sum is σ = 29446560. Its totient is φ = 21593088.

The previous prime is 25478821. The next prime is 25478857. The reversal of 25478831 is 13887452.

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 25478831 - 2¹⁸ = 25216687 is a prime.

It is a super-2 number, since 2×25478831² = 1298341658253122, which contains 22 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 (25478821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19826 + ... + 21071.

It is an arithmetic number, because the mean of its divisors is an integer number (3680820).

Almost surely, 2^25478831 is an apocalyptic number.

25478831 is a deficient number, since it is larger than the sum of its proper divisors (3967729).

25478831 is an equidigital number, since it uses as much as digits as its factorization.

25478831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40993.

The product of its digits is 53760, while the sum is 38.

The square root of 25478831 is about 5047.6559906555. The cubic root of 25478831 is about 294.2567943182.

The spelling of 25478831 in words is "twenty-five million, four hundred seventy-eight thousand, eight hundred thirty-one".