25649748 has 18 divisors (see below), whose sum is σ = 64836954. Its totient is φ = 8549904.

The previous prime is 25649747. The next prime is 25649749. The reversal of 25649748 is 84794652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25649747) and next prime (25649749).

It can be written as a sum of positive squares in only one way, i.e., 22867524 + 2782224 = 4782^2 + 1668^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25649747) 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 5 ways as a sum of consecutive naturals, for example, 356211 + ... + 356282.

It is an arithmetic number, because the mean of its divisors is an integer number (3602053).

Almost surely, 2^25649748 is an apocalyptic number.

It is an amenable number.

25649748 is an abundant number, since it is smaller than the sum of its proper divisors (39187206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25649748 is a wasteful number, since it uses less digits than its factorization.

25649748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712503 (or 712498 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 25649748 is about 5064.5580261263. The cubic root of 25649748 is about 294.9133059432.

The spelling of 25649748 in words is "twenty-five million, six hundred forty-nine thousand, seven hundred forty-eight".