28261506 has 64 divisors (see below), whose sum is σ = 70189056. Its totient is φ = 7387200.

The previous prime is 28261489. The next prime is 28261507. The reversal of 28261506 is 60516282.

It is not an unprimeable number, because it can be changed into a prime (28261507) 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 31 ways as a sum of consecutive naturals, for example, 104151 + ... + 104421.

It is an arithmetic number, because the mean of its divisors is an integer number (1096704).

Almost surely, 2^28261506 is an apocalyptic number.

28261506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28261506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35094528).

28261506 is an abundant number, since it is smaller than the sum of its proper divisors (41927550).

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

28261506 is a wasteful number, since it uses less digits than its factorization.

28261506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 28261506 is about 5316.1551896084. The cubic root of 28261506 is about 304.6013101167.

Adding to 28261506 its reverse (60516282), we get a palindrome (88777788).

The spelling of 28261506 in words is "twenty-eight million, two hundred sixty-one thousand, five hundred six".