28493109 has 12 divisors (see below), whose sum is σ = 42576300. Its totient is φ = 18340224.

The previous prime is 28493107. The next prime is 28493111. The reversal of 28493109 is 90139482.

It is an interprime number because it is at equal distance from previous prime (28493107) and next prime (28493111).

It can be written as a sum of positive squares in 2 ways, for example, as 7535025 + 20958084 = 2745^2 + 4578^2 .

It is not a de Polignac number, because 28493109 - 2¹ = 28493107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28493107) 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 11 ways as a sum of consecutive naturals, for example, 54324 + ... + 54845.

It is an arithmetic number, because the mean of its divisors is an integer number (3548025).

Almost surely, 2^28493109 is an apocalyptic number.

28493109 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28493109 is a deficient number, since it is larger than the sum of its proper divisors (14083191).

28493109 is a wasteful number, since it uses less digits than its factorization.

28493109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109204 (or 109201 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 28493109 is about 5337.8936857154. The cubic root of 28493109 is about 305.4311165694.

The spelling of 28493109 in words is "twenty-eight million, four hundred ninety-three thousand, one hundred nine".