25653240 has 64 divisors (see below), whose sum is σ = 85514400. Its totient is φ = 6840576.

The previous prime is 25653233. The next prime is 25653253. The reversal of 25653240 is 4235652.

25653240 is a `hidden beast` number, since 2 + 5 + 653 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10797 + ... + 12956.

Almost surely, 2^25653240 is an apocalyptic number.

25653240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25653240 is an abundant number, since it is smaller than the sum of its proper divisors (59861160).

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

25653240 is a wasteful number, since it uses less digits than its factorization.

25653240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23773 (or 23763 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 25653240 is about 5064.9027631338. The cubic root of 25653240 is about 294.9266886677.

Adding to 25653240 its reverse (4235652), we get a palindrome (29888892).

The spelling of 25653240 in words is "twenty-five million, six hundred fifty-three thousand, two hundred forty".