28445747 has 8 divisors (see below), whose sum is σ = 31753920. Its totient is φ = 25257960.

The previous prime is 28445701. The next prime is 28445749. The reversal of 28445747 is 74754482.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28445747 - 2¹⁶ = 28380211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28445749) 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 7 ways as a sum of consecutive naturals, for example, 29597 + ... + 30542.

It is an arithmetic number, because the mean of its divisors is an integer number (3969240).

Almost surely, 2^28445747 is an apocalyptic number.

28445747 is a deficient number, since it is larger than the sum of its proper divisors (3308173).

28445747 is a wasteful number, since it uses less digits than its factorization.

28445747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60193.

The product of its digits is 250880, while the sum is 41.

The square root of 28445747 is about 5333.4554465187. The cubic root of 28445747 is about 305.2617908199.

It can be divided in two parts, 28445 and 747, that added together give a palindrome (29192).

The spelling of 28445747 in words is "twenty-eight million, four hundred forty-five thousand, seven hundred forty-seven".