28420118 has 16 divisors (see below), whose sum is σ = 44136576. Its totient is φ = 13710720.

The previous prime is 28420109. The next prime is 28420129. The reversal of 28420118 is 81102482.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 36380 + ... + 37152.

It is an arithmetic number, because the mean of its divisors is an integer number (2758536).

Almost surely, 2^28420118 is an apocalyptic number.

28420118 is a deficient number, since it is larger than the sum of its proper divisors (15716458).

28420118 is a wasteful number, since it uses less digits than its factorization.

28420118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 28420118 is about 5331.0522413497. The cubic root of 28420118 is about 305.1700851924.

It can be divided in two parts, 284 and 20118, that added together give a palindrome (20402).

The spelling of 28420118 in words is "twenty-eight million, four hundred twenty thousand, one hundred eighteen".