25649465 has 4 divisors (see below), whose sum is σ = 30779364. Its totient is φ = 20519568.

The previous prime is 25649461. The next prime is 25649467. The reversal of 25649465 is 56494652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18826921 + 6822544 = 4339^2 + 2612^2 .

It is a cyclic number.

It is not a de Polignac number, because 25649465 - 2² = 25649461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25649461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2564942 + ... + 2564951.

It is an arithmetic number, because the mean of its divisors is an integer number (7694841).

Almost surely, 2^25649465 is an apocalyptic number.

It is an amenable number.

25649465 is a deficient number, since it is larger than the sum of its proper divisors (5129899).

25649465 is an equidigital number, since it uses as much as digits as its factorization.

25649465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129898.

The product of its digits is 259200, while the sum is 41.

The square root of 25649465 is about 5064.5300867899. The cubic root of 25649465 is about 294.9122213221.

The spelling of 25649465 in words is "twenty-five million, six hundred forty-nine thousand, four hundred sixty-five".