28375643 has 8 divisors (see below), whose sum is σ = 28749600. Its totient is φ = 28003968.

The previous prime is 28375631. The next prime is 28375663. The reversal of 28375643 is 34657382.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28375643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28375597 and 28375606.

It is not an unprimeable number, because it can be changed into a prime (28375663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47555 + ... + 48147.

It is an arithmetic number, because the mean of its divisors is an integer number (3593700).

Almost surely, 2^28375643 is an apocalyptic number.

28375643 is a deficient number, since it is larger than the sum of its proper divisors (373957).

28375643 is a wasteful number, since it uses less digits than its factorization.

28375643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141.

The product of its digits is 120960, while the sum is 38.

The square root of 28375643 is about 5326.8792927942. The cubic root of 28375643 is about 305.0108139138.

The spelling of 28375643 in words is "twenty-eight million, three hundred seventy-five thousand, six hundred forty-three".