25427540 has 24 divisors (see below), whose sum is σ = 53713800. Its totient is φ = 10110848.

The previous prime is 25427539. The next prime is 25427551. The reversal of 25427540 is 4572452.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9523396 + 15904144 = 3086^2 + 3988^2 .

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, 215 + ... + 7134.

It is an arithmetic number, because the mean of its divisors is an integer number (2238075).

Almost surely, 2^25427540 is an apocalyptic number.

25427540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25427540 is an abundant number, since it is smaller than the sum of its proper divisors (28286260).

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

25427540 is a wasteful number, since it uses less digits than its factorization.

25427540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7531 (or 7529 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 25427540 is about 5042.5727560443. The cubic root of 25427540 is about 294.0592072283.

Adding to 25427540 its reverse (4572452), we get a palindrome (29999992).

The spelling of 25427540 in words is "twenty-five million, four hundred twenty-seven thousand, five hundred forty".