28115449 has 8 divisors (see below), whose sum is σ = 29351048. Its totient is φ = 26904960.

The previous prime is 28115443. The next prime is 28115473. The reversal of 28115449 is 94451182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6325225 + 21790224 = 2515^2 + 4668^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28115449 - 2¹³ = 28107257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28115443) 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 in 7 ways as a sum of consecutive naturals, for example, 3972 + ... + 8485.

It is an arithmetic number, because the mean of its divisors is an integer number (3668881).

Almost surely, 2^28115449 is an apocalyptic number.

It is an amenable number.

28115449 is a deficient number, since it is larger than the sum of its proper divisors (1235599).

28115449 is a wasteful number, since it uses less digits than its factorization.

28115449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12555.

The product of its digits is 11520, while the sum is 34.

The square root of 28115449 is about 5302.4003055220. The cubic root of 28115449 is about 304.0756715190.

The spelling of 28115449 in words is "twenty-eight million, one hundred fifteen thousand, four hundred forty-nine".