25481840 has 20 divisors (see below), whose sum is σ = 59245464. Its totient is φ = 10192704.

The previous prime is 25481821. The next prime is 25481873. The reversal of 25481840 is 4818452.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 25481797 and 25481806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159182 + ... + 159341.

Almost surely, 2^25481840 is an apocalyptic number.

25481840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25481840 is an abundant number, since it is smaller than the sum of its proper divisors (33763624).

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

25481840 is a wasteful number, since it uses less digits than its factorization.

25481840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318536 (or 318530 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 25481840 is about 5047.9540409952. The cubic root of 25481840 is about 294.2683775791.

The spelling of 25481840 in words is "twenty-five million, four hundred eighty-one thousand, eight hundred forty".