25222784 has 32 divisors (see below), whose sum is σ = 50558340. Its totient is φ = 12533760.

The previous prime is 25222777. The next prime is 25222793. The reversal of 25222784 is 48722252.

It can be written as a sum of positive squares in 2 ways, for example, as 25000000 + 222784 = 5000^2 + 472^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 25222784.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24194 + ... + 25214.

Almost surely, 2^25222784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25222784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25279170).

25222784 is an abundant number, since it is smaller than the sum of its proper divisors (25335556).

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

25222784 is a wasteful number, since it uses less digits than its factorization.

25222784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228 (or 1216 counting only the distinct ones).

The product of its digits is 17920, while the sum is 32.

The square root of 25222784 is about 5022.2289872127. The cubic root of 25222784 is about 293.2677723085.

It can be divided in two parts, 25 and 222784, that multiplied together give a square (5569600 = 2360²).

The spelling of 25222784 in words is "twenty-five million, two hundred twenty-two thousand, seven hundred eighty-four".