28889005 has 8 divisors (see below), whose sum is σ = 34723224. Its totient is φ = 23073600.

The previous prime is 28888997. The next prime is 28889009. The reversal of 28889005 is 50098882.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2643876 + 26245129 = 1626^2 + 5123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28889005 - 2³ = 28888997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28889009) 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, 1066 + ... + 7675.

It is an arithmetic number, because the mean of its divisors is an integer number (4340403).

Almost surely, 2^28889005 is an apocalyptic number.

It is an amenable number.

28889005 is a deficient number, since it is larger than the sum of its proper divisors (5834219).

28889005 is an equidigital number, since it uses as much as digits as its factorization.

28889005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9407.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 28889005 is about 5374.8493002130. The cubic root of 28889005 is about 306.8392138353.

The spelling of 28889005 in words is "twenty-eight million, eight hundred eighty-nine thousand, five".