25439568 has 80 divisors (see below), whose sum is σ = 81947136. Its totient is φ = 6606720.

The previous prime is 25439543. The next prime is 25439569. The reversal of 25439568 is 86593452.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25439569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255 + ... + 7137.

Almost surely, 2^25439568 is an apocalyptic number.

25439568 is a gapful number since it is divisible by the number (28) 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 25439568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40973568).

25439568 is an abundant number, since it is smaller than the sum of its proper divisors (56507568).

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

25439568 is a wasteful number, since it uses less digits than its factorization.

25439568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6912 (or 6906 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 25439568 is about 5043.7652602000. The cubic root of 25439568 is about 294.1055662363.

The spelling of 25439568 in words is "twenty-five million, four hundred thirty-nine thousand, five hundred sixty-eight".