28161824 has 12 divisors (see below), whose sum is σ = 55443654. Its totient is φ = 14080896.

The previous prime is 28161797. The next prime is 28161827. The reversal of 28161824 is 42816182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28090000 + 71824 = 5300^2 + 268^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 880057 = 28161824 / (2 + 8 + 1 + 6 + 1 + 8 + 2 + 4).

It is not an unprimeable number, because it can be changed into a prime (28161827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439997 + ... + 440060.

Almost surely, 2^28161824 is an apocalyptic number.

It is an amenable number.

28161824 is a deficient number, since it is larger than the sum of its proper divisors (27281830).

28161824 is an equidigital number, since it uses as much as digits as its factorization.

28161824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880067 (or 880059 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 28161824 is about 5306.7715232522. The cubic root of 28161824 is about 304.2427654552.

The spelling of 28161824 in words is "twenty-eight million, one hundred sixty-one thousand, eight hundred twenty-four".