25648720 has 20 divisors (see below), whose sum is σ = 59633460. Its totient is φ = 10259456.

The previous prime is 25648717. The next prime is 25648723. The reversal of 25648720 is 2784652.

It is an interprime number because it is at equal distance from previous prime (25648717) and next prime (25648723).

It can be written as a sum of positive squares in 2 ways, for example, as 8904256 + 16744464 = 2984^2 + 4092^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25648723) 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, 160225 + ... + 160384.

It is an arithmetic number, because the mean of its divisors is an integer number (2981673).

Almost surely, 2^25648720 is an apocalyptic number.

25648720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25648720 is an abundant number, since it is smaller than the sum of its proper divisors (33984740).

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

25648720 is a wasteful number, since it uses less digits than its factorization.

25648720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320622 (or 320616 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 25648720 is about 5064.4565355031. The cubic root of 25648720 is about 294.9093660094.

The spelling of 25648720 in words is "twenty-five million, six hundred forty-eight thousand, seven hundred twenty".