25672221 has 24 divisors (see below), whose sum is σ = 39792480. Its totient is φ = 16520112.

The previous prime is 25672217. The next prime is 25672243. The reversal of 25672221 is 12227652.

It is not a de Polignac number, because 25672221 - 2² = 25672217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25672271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5226 + ... + 8868.

It is an arithmetic number, because the mean of its divisors is an integer number (1658020).

Almost surely, 2^25672221 is an apocalyptic number.

It is an amenable number.

25672221 is a deficient number, since it is larger than the sum of its proper divisors (14120259).

25672221 is an equidigital number, since it uses as much as digits as its factorization.

25672221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687 (or 3675 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 25672221 is about 5066.7761939916. The cubic root of 25672221 is about 294.9994101300. Note that the first 3 decimals are identical.

Adding to 25672221 its reverse (12227652), we get a palindrome (37899873).

The spelling of 25672221 in words is "twenty-five million, six hundred seventy-two thousand, two hundred twenty-one".