28421858 has 8 divisors (see below), whose sum is σ = 45140652. Its totient is φ = 13374976.

The previous prime is 28421857. The next prime is 28421863. The reversal of 28421858 is 85812482.

It can be written as a sum of positive squares in 2 ways, for example, as 26801329 + 1620529 = 5177^2 + 1273^2 .

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 (28421857) 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, 417935 + ... + 418002.

Almost surely, 2^28421858 is an apocalyptic number.

28421858 is a deficient number, since it is larger than the sum of its proper divisors (16718794).

28421858 is a wasteful number, since it uses less digits than its factorization.

28421858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835956.

The product of its digits is 40960, while the sum is 38.

The square root of 28421858 is about 5331.2154336511. The cubic root of 28421858 is about 305.1763130004.

The spelling of 28421858 in words is "twenty-eight million, four hundred twenty-one thousand, eight hundred fifty-eight".