28644658 has 8 divisors (see below), whose sum is σ = 49105152. Its totient is φ = 12276276.

The previous prime is 28644641. The next prime is 28644659. The reversal of 28644658 is 85644682.

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

It is not an unprimeable number, because it can be changed into a prime (28644659) 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, 1023010 + ... + 1023037.

It is an arithmetic number, because the mean of its divisors is an integer number (6138144).

Almost surely, 2^28644658 is an apocalyptic number.

28644658 is a deficient number, since it is larger than the sum of its proper divisors (20460494).

28644658 is a wasteful number, since it uses less digits than its factorization.

28644658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046056.

The product of its digits is 368640, while the sum is 43.

The square root of 28644658 is about 5352.0704404931. The cubic root of 28644658 is about 305.9716678170.

It can be divided in two parts, 286 and 44658, that added together give a palindrome (44944).

The spelling of 28644658 in words is "twenty-eight million, six hundred forty-four thousand, six hundred fifty-eight".