25646864 has 10 divisors (see below), whose sum is σ = 49690830. Its totient is φ = 12823424.

The previous prime is 25646861. The next prime is 25646867. The reversal of 25646864 is 46864652.

It is an interprime number because it is at equal distance from previous prime (25646861) and next prime (25646867).

It can be written as a sum of positive squares in only one way, i.e., 25603600 + 43264 = 5060^2 + 208^2 .

It is not an unprimeable number, because it can be changed into a prime (25646861) 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 as a sum of consecutive naturals, namely, 801449 + ... + 801480.

It is an arithmetic number, because the mean of its divisors is an integer number (4969083).

Almost surely, 2^25646864 is an apocalyptic number.

It is an amenable number.

25646864 is a deficient number, since it is larger than the sum of its proper divisors (24043966).

25646864 is a wasteful number, since it uses less digits than its factorization.

25646864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602937 (or 1602931 counting only the distinct ones).

The product of its digits is 276480, while the sum is 41.

The square root of 25646864 is about 5064.2732943632. The cubic root of 25646864 is about 294.9022523992.

The spelling of 25646864 in words is "twenty-five million, six hundred forty-six thousand, eight hundred sixty-four".