25438784250 has 128 divisors (see below), whose sum is σ = 70404422400. Its totient is φ = 6065760000.

The previous prime is 25438784213. The next prime is 25438784269. The reversal of 25438784250 is 5248783452.

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 25438784250.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 477976 + ... + 528524.

It is an arithmetic number, because the mean of its divisors is an integer number (550034550).

Almost surely, 2^25438784250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25438784250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35202211200).

25438784250 is an abundant number, since it is smaller than the sum of its proper divisors (44965638150).

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

25438784250 is a wasteful number, since it uses less digits than its factorization.

25438784250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50641 (or 50631 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 48.

The spelling of 25438784250 in words is "twenty-five billion, four hundred thirty-eight million, seven hundred eighty-four thousand, two hundred fifty".