28144506 has 16 divisors (see below), whose sum is σ = 60619104. Its totient is φ = 8659824.

The previous prime is 28144499. The next prime is 28144507. The reversal of 28144506 is 60544182.

It is a super-2 number, since 2×28144506² = 1584226435968072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28144507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180336 + ... + 180491.

It is an arithmetic number, because the mean of its divisors is an integer number (3788694).

Almost surely, 2^28144506 is an apocalyptic number.

28144506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28144506 is an abundant number, since it is smaller than the sum of its proper divisors (32474598).

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

28144506 is a wasteful number, since it uses less digits than its factorization.

28144506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360845.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28144506 is about 5305.1395834606. The cubic root of 28144506 is about 304.1803883804.

Adding to 28144506 its reverse (60544182), we get a palindrome (88688688).

The spelling of 28144506 in words is "twenty-eight million, one hundred forty-four thousand, five hundred six".