28615872 has 56 divisors (see below), whose sum is σ = 76500736. Its totient is φ = 9439488.

The previous prime is 28615861. The next prime is 28615877. The reversal of 28615872 is 27851682.

It is a self number, because there is not a number n which added to its sum of digits gives 28615872.

It is not an unprimeable number, because it can be changed into a prime (28615877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19053 + ... + 20499.

Almost surely, 2^28615872 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 28615872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38250368).

28615872 is an abundant number, since it is smaller than the sum of its proper divisors (47884864).

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

28615872 is a wasteful number, since it uses less digits than its factorization.

28615872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565 (or 1555 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 28615872 is about 5349.3805248832. The cubic root of 28615872 is about 305.8691396543.

The spelling of 28615872 in words is "twenty-eight million, six hundred fifteen thousand, eight hundred seventy-two".