25489664 has 36 divisors (see below), whose sum is σ = 53881884. Its totient is φ = 11993088.

The previous prime is 25489663. The next prime is 25489679. The reversal of 25489664 is 46698452.

It can be written as a sum of positive squares in 2 ways, for example, as 22278400 + 3211264 = 4720^2 + 1792^2 .

It is not an unprimeable number, because it can be changed into a prime (25489663) 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, 1424 + ... + 7280.

It is an arithmetic number, because the mean of its divisors is an integer number (1496719).

Almost surely, 2^25489664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25489664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26940942).

25489664 is an abundant number, since it is smaller than the sum of its proper divisors (28392220).

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

25489664 is an equidigital number, since it uses as much as digits as its factorization.

25489664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5890 (or 5876 counting only the distinct ones).

The product of its digits is 414720, while the sum is 44.

The square root of 25489664 is about 5048.7289489534. The cubic root of 25489664 is about 294.2984920997.

The spelling of 25489664 in words is "twenty-five million, four hundred eighty-nine thousand, six hundred sixty-four".