44288721 has 8 divisors (see below), whose sum is σ = 65612960. Its totient is φ = 29525796.

The previous prime is 44288707. The next prime is 44288747. The reversal of 44288721 is 12788244.

44288721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 44288721 - 2¹⁰ = 44287697 is a prime.

It is a super-2 number, since 2×44288721² = 3922981615631682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44288021) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 820135 + ... + 820188.

It is an arithmetic number, because the mean of its divisors is an integer number (8201620).

Almost surely, 2^44288721 is an apocalyptic number.

It is an amenable number.

44288721 is a deficient number, since it is larger than the sum of its proper divisors (21324239).

44288721 is a wasteful number, since it uses less digits than its factorization.

44288721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640332 (or 1640326 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 44288721 is about 6654.9771599909. The cubic root of 44288721 is about 353.8053368131.

The spelling of 44288721 in words is "forty-four million, two hundred eighty-eight thousand, seven hundred twenty-one".