22781250 has 98 divisors (see below), whose sum is σ = 64042149. Its totient is φ = 6075000.

The previous prime is 22781221. The next prime is 22781261. The reversal of 22781250 is 5218722.

It can be written as a sum of positive squares in 4 ways, for example, as 3884841 + 18896409 = 1971^2 + 4347^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3375.

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

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 48 ways as a sum of consecutive naturals, for example, 4556248 + ... + 4556252.

Almost surely, 2^22781250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22781250

22781250 is an abundant number, since it is smaller than the sum of its proper divisors (41260899).

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

22781250 is an frugal number, since it uses more digits than its factorization.

22781250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 22781250 is about 4772.9707730092. The cubic root of 22781250 is about 283.4822362263.

Adding to 22781250 its reverse (5218722), we get a palindrome (27999972).

The spelling of 22781250 in words is "twenty-two million, seven hundred eighty-one thousand, two hundred fifty".