25648660 has 24 divisors (see below), whose sum is σ = 54514656. Its totient is φ = 10135200.

The previous prime is 25648639. The next prime is 25648663. The reversal of 25648660 is 6684652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25648663) 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, 6066 + ... + 9385.

It is an arithmetic number, because the mean of its divisors is an integer number (2271444).

Almost surely, 2^25648660 is an apocalyptic number.

25648660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25648660 is an abundant number, since it is smaller than the sum of its proper divisors (28865996).

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

25648660 is a wasteful number, since it uses less digits than its factorization.

25648660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15543 (or 15541 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 25648660 is about 5064.4506118630. The cubic root of 25648660 is about 294.9091360489.

The spelling of 25648660 in words is "twenty-five million, six hundred forty-eight thousand, six hundred sixty".