25722009 has 8 divisors (see below), whose sum is σ = 38106720. Its totient is φ = 17147988.

The previous prime is 25721999. The next prime is 25722023. The reversal of 25722009 is 90022752.

It is a happy number.

It is not a de Polignac number, because 25722009 - 2⁵ = 25721977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 952667 = 25722009 / (2 + 5 + 7 + 2 + 2 + 0 + 0 + 9).

It is not an unprimeable number, because it can be changed into a prime (25722079) 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, 476307 + ... + 476360.

It is an arithmetic number, because the mean of its divisors is an integer number (4763340).

Almost surely, 2^25722009 is an apocalyptic number.

It is an amenable number.

25722009 is a deficient number, since it is larger than the sum of its proper divisors (12384711).

25722009 is an equidigital number, since it uses as much as digits as its factorization.

25722009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952676 (or 952670 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 25722009 is about 5071.6869974398. The cubic root of 25722009 is about 295.1899915636.

The spelling of 25722009 in words is "twenty-five million, seven hundred twenty-two thousand, nine".