25684631 has 8 divisors (see below), whose sum is σ = 30036864. Its totient is φ = 21503160.

The previous prime is 25684627. The next prime is 25684639. The reversal of 25684631 is 13648652.

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

It is not a de Polignac number, because 25684631 - 2² = 25684627 is a prime.

It is a super-2 number, since 2×25684631² = 1319400539212322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25684591 and 25684600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25684639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42365 + ... + 42966.

It is an arithmetic number, because the mean of its divisors is an integer number (3754608).

Almost surely, 2^25684631 is an apocalyptic number.

25684631 is a deficient number, since it is larger than the sum of its proper divisors (4352233).

25684631 is an equidigital number, since it uses as much as digits as its factorization.

25684631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85381.

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

The square root of 25684631 is about 5068.0006906077. Note that the first 3 decimals coincide. The cubic root of 25684631 is about 295.0469368962.

The spelling of 25684631 in words is "twenty-five million, six hundred eighty-four thousand, six hundred thirty-one".