25533240 has 32 divisors (see below), whose sum is σ = 76600080. Its totient is φ = 6808832.

The previous prime is 25533239. The next prime is 25533241. The reversal of 25533240 is 4233552.

It is an interprime number because it is at equal distance from previous prime (25533239) and next prime (25533241).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25533240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25533241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106269 + ... + 106508.

Almost surely, 2^25533240 is an apocalyptic number.

25533240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25533240 is an abundant number, since it is smaller than the sum of its proper divisors (51066840).

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

25533240 is a wasteful number, since it uses less digits than its factorization.

25533240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212791 (or 212787 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 24.

The square root of 25533240 is about 5053.0426477519. The cubic root of 25533240 is about 294.4661031759.

Adding to 25533240 its reverse (4233552), we get a palindrome (29766792).

The spelling of 25533240 in words is "twenty-five million, five hundred thirty-three thousand, two hundred forty".