25071640 has 64 divisors (see below), whose sum is σ = 64800000. Its totient is φ = 8634240.

The previous prime is 25071619. The next prime is 25071643. The reversal of 25071640 is 4617052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25071643) 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 15 ways as a sum of consecutive naturals, for example, 6861 + ... + 9859.

It is an arithmetic number, because the mean of its divisors is an integer number (1012500).

Almost surely, 2^25071640 is an apocalyptic number.

25071640 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 25071640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32400000).

25071640 is an abundant number, since it is smaller than the sum of its proper divisors (39728360).

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

25071640 is a wasteful number, since it uses less digits than its factorization.

25071640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040 (or 3036 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 25071640 is about 5007.1588750508. The cubic root of 25071640 is about 292.6808096301.

Adding to 25071640 its reverse (4617052), we get a palindrome (29688692).

The spelling of 25071640 in words is "twenty-five million, seventy-one thousand, six hundred forty".