25634861 has 16 divisors (see below), whose sum is σ = 32025600. Its totient is φ = 20010240.

The previous prime is 25634813. The next prime is 25634867. The reversal of 25634861 is 16843652.

It is a cyclic number.

It is not a de Polignac number, because 25634861 - 2¹⁴ = 25618477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25634867) 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 in 15 ways as a sum of consecutive naturals, for example, 215 + ... + 7163.

It is an arithmetic number, because the mean of its divisors is an integer number (2001600).

Almost surely, 2^25634861 is an apocalyptic number.

It is an amenable number.

25634861 is a deficient number, since it is larger than the sum of its proper divisors (6390739).

25634861 is a wasteful number, since it uses less digits than its factorization.

25634861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7004.

The product of its digits is 34560, while the sum is 35.

The square root of 25634861 is about 5063.0880892989. The cubic root of 25634861 is about 294.8562394430.

The spelling of 25634861 in words is "twenty-five million, six hundred thirty-four thousand, eight hundred sixty-one".