28379643 has 4 divisors (see below), whose sum is σ = 37839528. Its totient is φ = 18919760.

The previous prime is 28379641. The next prime is 28379651. The reversal of 28379643 is 34697382.

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 28379643 - 2¹ = 28379641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28379595 and 28379604.

It is not an unprimeable number, because it can be changed into a prime (28379641) 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, 4729938 + ... + 4729943.

It is an arithmetic number, because the mean of its divisors is an integer number (9459882).

Almost surely, 2^28379643 is an apocalyptic number.

28379643 is a deficient number, since it is larger than the sum of its proper divisors (9459885).

28379643 is an equidigital number, since it uses as much as digits as its factorization.

28379643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9459884.

The product of its digits is 217728, while the sum is 42.

The square root of 28379643 is about 5327.2547339131. The cubic root of 28379643 is about 305.0251452887.

The spelling of 28379643 in words is "twenty-eight million, three hundred seventy-nine thousand, six hundred forty-three".