28444647 has 40 divisors (see below), whose sum is σ = 48401280. Its totient is φ = 14735280.

The previous prime is 28444597. The next prime is 28444657. The reversal of 28444647 is 74644482.

It is not a de Polignac number, because 28444647 - 2¹² = 28440551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28444657) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 79054 + ... + 79412.

It is an arithmetic number, because the mean of its divisors is an integer number (1210032).

Almost surely, 2^28444647 is an apocalyptic number.

28444647 is a deficient number, since it is larger than the sum of its proper divisors (19956633).

28444647 is an equidigital number, since it uses as much as digits as its factorization.

28444647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 380 counting only the distinct ones).

The product of its digits is 172032, while the sum is 39.

The square root of 28444647 is about 5333.3523228829. The cubic root of 28444647 is about 305.2578559341.

The spelling of 28444647 in words is "twenty-eight million, four hundred forty-four thousand, six hundred forty-seven".