25761240 has 80 divisors (see below), whose sum is σ = 86597280. Its totient is φ = 6868800.

The previous prime is 25761221. The next prime is 25761247. The reversal of 25761240 is 4216752.

25761240 is a `hidden beast` number, since 2 + 5 + 7 + 612 + 40 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25761247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 736 + ... + 7215.

It is an arithmetic number, because the mean of its divisors is an integer number (1082466).

Almost surely, 2^25761240 is an apocalyptic number.

25761240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25761240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43298640).

25761240 is an abundant number, since it is smaller than the sum of its proper divisors (60836040).

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

25761240 is a wasteful number, since it uses less digits than its factorization.

25761240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7974 (or 7961 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 25761240 is about 5075.5531718228. The cubic root of 25761240 is about 295.3399891267.

Adding to 25761240 its reverse (4216752), we get a palindrome (29977992).

The spelling of 25761240 in words is "twenty-five million, seven hundred sixty-one thousand, two hundred forty".