25421550 has 192 divisors, whose sum is σ = 82280448. Its totient is φ = 5040000.

The previous prime is 25421549. The next prime is 25421551. The reversal of 25421550 is 5512452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25421549) and next prime (25421551).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25421550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421551) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 358015 + ... + 358085.

It is an arithmetic number, because the mean of its divisors is an integer number (428544).

Almost surely, 2^25421550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25421550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41140224).

25421550 is an abundant number, since it is smaller than the sum of its proper divisors (56858898).

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

25421550 is a wasteful number, since it uses less digits than its factorization.

25421550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 25421550 is about 5041.9787782179. The cubic root of 25421550 is about 294.0361147731.

The spelling of 25421550 in words is "twenty-five million, four hundred twenty-one thousand, five hundred fifty".