22280729 has 4 divisors (see below), whose sum is σ = 23049060. Its totient is φ = 21512400.

The previous prime is 22280719. The next prime is 22280743. The reversal of 22280729 is 92708222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14707225 + 7573504 = 3835^2 + 2752^2 .

It is a cyclic number.

It is not a de Polignac number, because 22280729 - 2⁸ = 22280473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22280695 and 22280704.

It is not an unprimeable number, because it can be changed into a prime (22280719) 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, 384122 + ... + 384179.

It is an arithmetic number, because the mean of its divisors is an integer number (5762265).

Almost surely, 2^22280729 is an apocalyptic number.

22280729 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

22280729 is a deficient number, since it is larger than the sum of its proper divisors (768331).

22280729 is an equidigital number, since it uses as much as digits as its factorization.

22280729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768330.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 22280729 is about 4720.2467096541. The cubic root of 22280729 is about 281.3907381880.

The spelling of 22280729 in words is "twenty-two million, two hundred eighty thousand, seven hundred twenty-nine".