25431936 has 64 divisors (see below), whose sum is σ = 68315520. Its totient is φ = 8381952.

The previous prime is 25431911. The next prime is 25431941. The reversal of 25431936 is 63913452.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 25431897 and 25431906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39231 + ... + 39873.

It is an arithmetic number, because the mean of its divisors is an integer number (1067430).

Almost surely, 2^25431936 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 25431936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34157760).

25431936 is an abundant number, since it is smaller than the sum of its proper divisors (42883584).

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

25431936 is a wasteful number, since it uses less digits than its factorization.

25431936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763 (or 751 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 25431936 is about 5043.0086258106. The cubic root of 25431936 is about 294.0761522386.

The spelling of 25431936 in words is "twenty-five million, four hundred thirty-one thousand, nine hundred thirty-six".