28261872 has 70 divisors (see below), whose sum is σ = 82132392. Its totient is φ = 9416736.

The previous prime is 28261843. The next prime is 28261903. The reversal of 28261872 is 27816282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 10453 + ... + 12875.

Almost surely, 2^28261872 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 28261872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41066196).

28261872 is an abundant number, since it is smaller than the sum of its proper divisors (53870520).

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

28261872 is an equidigital number, since it uses as much as digits as its factorization.

28261872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449 (or 2428 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28261872 is about 5316.1896128712. The cubic root of 28261872 is about 304.6026250218.

The spelling of 28261872 in words is "twenty-eight million, two hundred sixty-one thousand, eight hundred seventy-two".