28487628 has 72 divisors (see below), whose sum is σ = 80262000. Its totient is φ = 8459136.

The previous prime is 28487623. The next prime is 28487651. The reversal of 28487628 is 82678482.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28487623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12523 + ... + 14621.

It is an arithmetic number, because the mean of its divisors is an integer number (1114750).

Almost surely, 2^28487628 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 28487628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40131000).

28487628 is an abundant number, since it is smaller than the sum of its proper divisors (51774372).

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

28487628 is a wasteful number, since it uses less digits than its factorization.

28487628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151 (or 2146 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 28487628 is about 5337.3802562681. The cubic root of 28487628 is about 305.4115308361.

The spelling of 28487628 in words is "twenty-eight million, four hundred eighty-seven thousand, six hundred twenty-eight".