22072500 has 150 divisors (see below), whose sum is σ = 72765770. Its totient is φ = 5832000.

The previous prime is 22072487. The next prime is 22072517. The reversal of 22072500 is 527022.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 6533136 + 15539364 = 2556^2 + 3942^2 .

It is a tau number, because it is divible by the number of its divisors (150).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 202446 + ... + 202554.

Almost surely, 2^22072500 is an apocalyptic number.

22072500 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 22072500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36382885).

22072500 is an abundant number, since it is smaller than the sum of its proper divisors (50693270).

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

22072500 is a wasteful number, since it uses less digits than its factorization.

22072500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 18.

The square root of 22072500 is about 4698.1379290097. The cubic root of 22072500 is about 280.5113953448.

Adding to 22072500 its reverse (527022), we get a palindrome (22599522).

The spelling of 22072500 in words is "twenty-two million, seventy-two thousand, five hundred".