28337121 has 10 divisors (see below), whose sum is σ = 42330882. Its totient is φ = 18891360.

The previous prime is 28337119. The next prime is 28337137. The reversal of 28337121 is 12173382.

It can be written as a sum of positive squares in only one way, i.e., 21986721 + 6350400 = 4689^2 + 2520^2 .

It is not a de Polignac number, because 28337121 - 2¹ = 28337119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28337821) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 174840 + ... + 175001.

Almost surely, 2^28337121 is an apocalyptic number.

It is an amenable number.

28337121 is a deficient number, since it is larger than the sum of its proper divisors (13993761).

28337121 is an equidigital number, since it uses as much as digits as its factorization.

28337121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349853 (or 349844 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 28337121 is about 5323.2622516649. The cubic root of 28337121 is about 304.8727266162.

The spelling of 28337121 in words is "twenty-eight million, three hundred thirty-seven thousand, one hundred twenty-one".