25487440 has 60 divisors (see below), whose sum is σ = 65159892. Its totient is φ = 9264640.

The previous prime is 25487431. The next prime is 25487443. The reversal of 25487440 is 4478452.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6512704 + 18974736 = 2552^2 + 4356^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25487396 and 25487405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25487443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8364 + ... + 10996.

Almost surely, 2^25487440 is an apocalyptic number.

25487440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25487440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32579946).

25487440 is an abundant number, since it is smaller than the sum of its proper divisors (39672452).

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

25487440 is a wasteful number, since it uses less digits than its factorization.

25487440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668 (or 2651 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 25487440 is about 5048.5086906927. The cubic root of 25487440 is about 294.2899325664.

The spelling of 25487440 in words is "twenty-five million, four hundred eighty-seven thousand, four hundred forty".