28424394 has 24 divisors (see below), whose sum is σ = 61740900. Its totient is φ = 9451008.

The previous prime is 28424393. The next prime is 28424401. The reversal of 28424394 is 49342482.

It can be written as a sum of positive squares in 2 ways, for example, as 25130169 + 3294225 = 5013^2 + 1815^2 .

It is not an unprimeable number, because it can be changed into a prime (28424393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6324 + ... + 9840.

Almost surely, 2^28424394 is an apocalyptic number.

28424394 is an abundant number, since it is smaller than the sum of its proper divisors (33316506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28424394 is a wasteful number, since it uses less digits than its factorization.

28424394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974 (or 3971 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 28424394 is about 5331.4532727953. The cubic root of 28424394 is about 305.1853893963.

The spelling of 28424394 in words is "twenty-eight million, four hundred twenty-four thousand, three hundred ninety-four".