28261436 has 36 divisors (see below), whose sum is σ = 60568200. Its totient is φ = 11473056.

The previous prime is 28261433. The next prime is 28261447. The reversal of 28261436 is 63416282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28261433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71 + ... + 7518.

It is an arithmetic number, because the mean of its divisors is an integer number (1682450).

Almost surely, 2^28261436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28261436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30284100).

28261436 is an abundant number, since it is smaller than the sum of its proper divisors (32306764).

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

28261436 is a wasteful number, since it uses less digits than its factorization.

28261436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7626 (or 7617 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 28261436 is about 5316.1486058988. The cubic root of 28261436 is about 304.6010586308.

The spelling of 28261436 in words is "twenty-eight million, two hundred sixty-one thousand, four hundred thirty-six".