28403842 has 4 divisors (see below), whose sum is σ = 42605766. Its totient is φ = 14201920.

The previous prime is 28403833. The next prime is 28403849. The reversal of 28403842 is 24830482.

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

It can be written as a sum of positive squares in only one way, i.e., 15594601 + 12809241 = 3949^2 + 3579^2 .

It is not an unprimeable number, because it can be changed into a prime (28403849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7100959 + ... + 7100962.

Almost surely, 2^28403842 is an apocalyptic number.

28403842 is a deficient number, since it is larger than the sum of its proper divisors (14201924).

28403842 is a wasteful number, since it uses less digits than its factorization.

28403842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14201923.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 28403842 is about 5329.5254948260. The cubic root of 28403842 is about 305.1118178201. Note that the first 3 decimals are identical.

The spelling of 28403842 in words is "twenty-eight million, four hundred three thousand, eight hundred forty-two".