28645894 has 4 divisors (see below), whose sum is σ = 42968844. Its totient is φ = 14322946.

The previous prime is 28645861. The next prime is 28645909. The reversal of 28645894 is 49854682.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7161472 + ... + 7161475.

It is an arithmetic number, because the mean of its divisors is an integer number (10742211).

Almost surely, 2^28645894 is an apocalyptic number.

28645894 is a deficient number, since it is larger than the sum of its proper divisors (14322950).

28645894 is a wasteful number, since it uses less digits than its factorization.

28645894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14322949.

The product of its digits is 552960, while the sum is 46.

The square root of 28645894 is about 5352.1859085798. The cubic root of 28645894 is about 305.9760685857.

The spelling of 28645894 in words is "twenty-eight million, six hundred forty-five thousand, eight hundred ninety-four".