22072730 has 8 divisors (see below), whose sum is σ = 39730932. Its totient is φ = 8829088.

The previous prime is 22072723. The next prime is 22072733. The reversal of 22072730 is 3727022.

It can be written as a sum of positive squares in 2 ways, for example, as 19386409 + 2686321 = 4403^2 + 1639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22072696 and 22072705.

It is not an unprimeable number, because it can be changed into a prime (22072733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103627 + ... + 1103646.

Almost surely, 2^22072730 is an apocalyptic number.

22072730 is a deficient number, since it is larger than the sum of its proper divisors (17658202).

22072730 is a wasteful number, since it uses less digits than its factorization.

22072730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207280.

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 22072730 is about 4698.1624067288. The cubic root of 22072730 is about 280.5123696702.

Adding to 22072730 its reverse (3727022), we get a palindrome (25799752).

The spelling of 22072730 in words is "twenty-two million, seventy-two thousand, seven hundred thirty".