28740149 has 4 divisors (see below), whose sum is σ = 30430764. Its totient is φ = 27049536.

The previous prime is 28740113. The next prime is 28740169. The reversal of 28740149 is 94104782.

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 23833924 + 4906225 = 4882^2 + 2215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28740149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28740169) 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, 845282 + ... + 845315.

It is an arithmetic number, because the mean of its divisors is an integer number (7607691).

Almost surely, 2^28740149 is an apocalyptic number.

It is an amenable number.

28740149 is a deficient number, since it is larger than the sum of its proper divisors (1690615).

28740149 is a wasteful number, since it uses less digits than its factorization.

28740149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690614.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28740149 is about 5360.9839581927. The cubic root of 28740149 is about 306.3112905790.

The spelling of 28740149 in words is "twenty-eight million, seven hundred forty thousand, one hundred forty-nine".