28355149 has 4 divisors (see below), whose sum is σ = 29046780. Its totient is φ = 27663520.

The previous prime is 28355143. The next prime is 28355161. The reversal of 28355149 is 94155382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3305124 + 25050025 = 1818^2 + 5005^2 .

It is not a de Polignac number, because 28355149 - 2⁹ = 28354637 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 (28355143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345754 + ... + 345835.

It is an arithmetic number, because the mean of its divisors is an integer number (7261695).

Almost surely, 2^28355149 is an apocalyptic number.

It is an amenable number.

28355149 is a deficient number, since it is larger than the sum of its proper divisors (691631).

28355149 is an equidigital number, since it uses as much as digits as its factorization.

28355149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691630.

The product of its digits is 43200, while the sum is 37.

The square root of 28355149 is about 5324.9553049767. The cubic root of 28355149 is about 304.9373659793.

The spelling of 28355149 in words is "twenty-eight million, three hundred fifty-five thousand, one hundred forty-nine".