25616340 has 72 divisors (see below), whose sum is σ = 79010568. Its totient is φ = 6716160.

The previous prime is 25616333. The next prime is 25616369. The reversal of 25616340 is 4361652.

25616340 is a `hidden beast` number, since 2 + 5 + 616 + 3 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 25522704 = 306^2 + 5052^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9814 + ... + 12146.

It is an arithmetic number, because the mean of its divisors is an integer number (1097369).

Almost surely, 2^25616340 is an apocalyptic number.

25616340 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 25616340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39505284).

25616340 is an abundant number, since it is smaller than the sum of its proper divisors (53394228).

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

25616340 is a wasteful number, since it uses less digits than its factorization.

25616340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409 (or 2404 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 25616340 is about 5061.2587367176. The cubic root of 25616340 is about 294.7852118409.

Adding to 25616340 its reverse (4361652), we get a palindrome (29977992).

The spelling of 25616340 in words is "twenty-five million, six hundred sixteen thousand, three hundred forty".