28420242 has 32 divisors (see below), whose sum is σ = 59940864. Its totient is φ = 8970000.

The previous prime is 28420237. The next prime is 28420247. The reversal of 28420242 is 24202482.

It is an interprime number because it is at equal distance from previous prime (28420237) and next prime (28420247).

It is not an unprimeable number, because it can be changed into a prime (28420247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7117 + ... + 10367.

It is an arithmetic number, because the mean of its divisors is an integer number (1873152).

Almost surely, 2^28420242 is an apocalyptic number.

28420242 is an abundant number, since it is smaller than the sum of its proper divisors (31520622).

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

28420242 is a wasteful number, since it uses less digits than its factorization.

28420242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334.

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 28420242 is about 5331.0638713112. The cubic root of 28420242 is about 305.1705290216.

The spelling of 28420242 in words is "twenty-eight million, four hundred twenty thousand, two hundred forty-two".