28894643 has 4 divisors (see below), whose sum is σ = 29891040. Its totient is φ = 27898248.

The previous prime is 28894639. The next prime is 28894661. The reversal of 28894643 is 34649882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28894643 - 2² = 28894639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28894594 and 28894603.

It is not an unprimeable number, because it can be changed into a prime (28894673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498155 + ... + 498212.

It is an arithmetic number, because the mean of its divisors is an integer number (7472760).

Almost surely, 2^28894643 is an apocalyptic number.

28894643 is a deficient number, since it is larger than the sum of its proper divisors (996397).

28894643 is an equidigital number, since it uses as much as digits as its factorization.

28894643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996396.

The product of its digits is 331776, while the sum is 44.

The square root of 28894643 is about 5375.3737544472. The cubic root of 28894643 is about 306.8591735277.

The spelling of 28894643 in words is "twenty-eight million, eight hundred ninety-four thousand, six hundred forty-three".