28328872 has 32 divisors (see below), whose sum is σ = 62405280. Its totient is φ = 11885760.

The previous prime is 28328863. The next prime is 28328879. The reversal of 28328872 is 27882382.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28328879) 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, 11238 + ... + 13525.

It is an arithmetic number, because the mean of its divisors is an integer number (1950165).

Almost surely, 2^28328872 is an apocalyptic number.

28328872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28328872 is an abundant number, since it is smaller than the sum of its proper divisors (34076408).

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

28328872 is a wasteful number, since it uses less digits than its factorization.

28328872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24793 (or 24789 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 28328872 is about 5322.4873884303. The cubic root of 28328872 is about 304.8431406985.

The spelling of 28328872 in words is "twenty-eight million, three hundred twenty-eight thousand, eight hundred seventy-two".