28219136 has 54 divisors (see below), whose sum is σ = 61982256. Its totient is φ = 12812800.

The previous prime is 28219073. The next prime is 28219153. The reversal of 28219136 is 63191282.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30521 + ... + 31431.

Almost surely, 2^28219136 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 28219136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30991128).

28219136 is an abundant number, since it is smaller than the sum of its proper divisors (33763120).

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

28219136 is an equidigital number, since it uses as much as digits as its factorization.

28219136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949 (or 924 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 28219136 is about 5312.1686720209. The cubic root of 28219136 is about 304.4490132967.

The spelling of 28219136 in words is "twenty-eight million, two hundred nineteen thousand, one hundred thirty-six".