28296643 has 4 divisors (see below), whose sum is σ = 29785960. Its totient is φ = 26807328.

The previous prime is 28296629. The next prime is 28296659. The reversal of 28296643 is 34669282.

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

It is a de Polignac number, because none of the positive numbers 2^k-28296643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28296596 and 28296605.

It is not an unprimeable number, because it can be changed into a prime (28290643) 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, 744630 + ... + 744667.

It is an arithmetic number, because the mean of its divisors is an integer number (7446490).

Almost surely, 2^28296643 is an apocalyptic number.

28296643 is a deficient number, since it is larger than the sum of its proper divisors (1489317).

28296643 is a wasteful number, since it uses less digits than its factorization.

28296643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489316.

The product of its digits is 124416, while the sum is 40.

The square root of 28296643 is about 5319.4589010538. The cubic root of 28296643 is about 304.7274928683.

The spelling of 28296643 in words is "twenty-eight million, two hundred ninety-six thousand, six hundred forty-three".