28802172 has 48 divisors (see below), whose sum is σ = 78688512. Its totient is φ = 8027520.

The previous prime is 28802167. The next prime is 28802173. The reversal of 28802172 is 27120882.

It is a happy number.

It is a super-2 number, since 2×28802172² = 1659130223835168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28802173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 738 + ... + 7625.

It is an arithmetic number, because the mean of its divisors is an integer number (1639344).

Almost surely, 2^28802172 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 28802172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39344256).

28802172 is an abundant number, since it is smaller than the sum of its proper divisors (49886340).

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

28802172 is a wasteful number, since it uses less digits than its factorization.

28802172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8418 (or 8416 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28802172 is about 5366.7655063362. The cubic root of 28802172 is about 306.5314784308.

The spelling of 28802172 in words is "twenty-eight million, eight hundred two thousand, one hundred seventy-two".