28641843 has 10 divisors (see below), whose sum is σ = 42786084. Its totient is φ = 19094508.

The previous prime is 28641793. The next prime is 28641853. The reversal of 28641843 is 34814682.

28641843 is a `hidden beast` number, since 2 + 8 + 641 + 8 + 4 + 3 = 666.

It is not a de Polignac number, because 28641843 - 2¹² = 28637747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28641798 and 28641807.

It is not an unprimeable number, because it can be changed into a prime (28641853) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 176721 + ... + 176882.

Almost surely, 2^28641843 is an apocalyptic number.

28641843 is a deficient number, since it is larger than the sum of its proper divisors (14144241).

28641843 is an equidigital number, since it uses as much as digits as its factorization.

28641843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353615 (or 353606 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 28641843 is about 5351.8074516933. The cubic root of 28641843 is about 305.9616445582.

The spelling of 28641843 in words is "twenty-eight million, six hundred forty-one thousand, eight hundred forty-three".