28693872 has 80 divisors (see below), whose sum is σ = 83169280. Its totient is φ = 9471168.

The previous prime is 28693871. The next prime is 28693901. The reversal of 28693872 is 27839682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28693871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54603 + ... + 55125.

It is an arithmetic number, because the mean of its divisors is an integer number (1039616).

Almost surely, 2^28693872 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 28693872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41584640).

28693872 is an abundant number, since it is smaller than the sum of its proper divisors (54475408).

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

28693872 is a wasteful number, since it uses less digits than its factorization.

28693872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 655 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28693872 is about 5356.6661273594. Note that the first 3 decimals coincide. The cubic root of 28693872 is about 306.1467961566.

The spelling of 28693872 in words is "twenty-eight million, six hundred ninety-three thousand, eight hundred seventy-two".