22287729 has 16 divisors (see below), whose sum is σ = 31334400. Its totient is φ = 14070480.

The previous prime is 22287709. The next prime is 22287737. The reversal of 22287729 is 92778222.

It is a de Polignac number, because none of the positive numbers 2^k-22287729 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22287709) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1822 + ... + 6920.

It is an arithmetic number, because the mean of its divisors is an integer number (1958400).

Almost surely, 2^22287729 is an apocalyptic number.

It is an amenable number.

22287729 is a deficient number, since it is larger than the sum of its proper divisors (9046671).

22287729 is a wasteful number, since it uses less digits than its factorization.

22287729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180.

The product of its digits is 56448, while the sum is 39.

The square root of 22287729 is about 4720.9881380914. The cubic root of 22287729 is about 281.4202035454.

The spelling of 22287729 in words is "twenty-two million, two hundred eighty-seven thousand, seven hundred twenty-nine".