28148149 has 4 divisors (see below), whose sum is σ = 28421536. Its totient is φ = 27874764.

The previous prime is 28148137. The next prime is 28148161. The reversal of 28148149 is 94184182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28148137) and next prime (28148161).

It is a cyclic number.

It is not a de Polignac number, because 28148149 - 2⁵ = 28148117 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 (28148129) 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 3 ways as a sum of consecutive naturals, for example, 136539 + ... + 136744.

It is an arithmetic number, because the mean of its divisors is an integer number (7105384).

Almost surely, 2^28148149 is an apocalyptic number.

It is an amenable number.

28148149 is a deficient number, since it is larger than the sum of its proper divisors (273387).

28148149 is a wasteful number, since it uses less digits than its factorization.

28148149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273386.

The product of its digits is 18432, while the sum is 37.

The square root of 28148149 is about 5305.4829186418. The cubic root of 28148149 is about 304.1935120944.

The spelling of 28148149 in words is "twenty-eight million, one hundred forty-eight thousand, one hundred forty-nine".