28641872 has 80 divisors (see below), whose sum is σ = 68745600. Its totient is φ = 11515392.

The previous prime is 28641859. The next prime is 28641881. The reversal of 28641872 is 27814682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93143 + ... + 93449.

It is an arithmetic number, because the mean of its divisors is an integer number (859320).

Almost surely, 2^28641872 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 28641872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34372800).

28641872 is an abundant number, since it is smaller than the sum of its proper divisors (40103728).

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

28641872 is a wasteful number, since it uses less digits than its factorization.

28641872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 333 counting only the distinct ones).

The product of its digits is 43008, while the sum is 38.

The square root of 28641872 is about 5351.8101610577. The cubic root of 28641872 is about 305.9617478207.

The spelling of 28641872 in words is "twenty-eight million, six hundred forty-one thousand, eight hundred seventy-two".