28747445 has 8 divisors (see below), whose sum is σ = 34885080. Its totient is φ = 22739200.

The previous prime is 28747429. The next prime is 28747471. The reversal of 28747445 is 54474782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4165681 + 24581764 = 2041^2 + 4958^2 .

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

It is not a de Polignac number, because 28747445 - 2⁴ = 28747429 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31856 + ... + 32745.

It is an arithmetic number, because the mean of its divisors is an integer number (4360635).

Almost surely, 2^28747445 is an apocalyptic number.

It is an amenable number.

28747445 is a deficient number, since it is larger than the sum of its proper divisors (6137635).

28747445 is an equidigital number, since it uses as much as digits as its factorization.

28747445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64695.

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

The square root of 28747445 is about 5361.6643871097. The cubic root of 28747445 is about 306.3372085389.

It can be divided in two parts, 28747 and 445, that added together give a palindrome (29192).

The spelling of 28747445 in words is "twenty-eight million, seven hundred forty-seven thousand, four hundred forty-five".