25864813 has 8 divisors (see below), whose sum is σ = 28607768. Its totient is φ = 23229504.

The previous prime is 25864807. The next prime is 25864823. The reversal of 25864813 is 31846852.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6487209 + 19377604 = 2547^2 + 4402^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25864813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25864823) 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, 26406 + ... + 27367.

It is an arithmetic number, because the mean of its divisors is an integer number (3575971).

Almost surely, 2^25864813 is an apocalyptic number.

It is an amenable number.

25864813 is a deficient number, since it is larger than the sum of its proper divisors (2742955).

25864813 is a wasteful number, since it uses less digits than its factorization.

25864813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53823.

The product of its digits is 46080, while the sum is 37.

The square root of 25864813 is about 5085.7460612972. The cubic root of 25864813 is about 295.7352644233.

The spelling of 25864813 in words is "twenty-five million, eight hundred sixty-four thousand, eight hundred thirteen".