28271749 has 8 divisors (see below), whose sum is σ = 31142592. Its totient is φ = 25451040.

The previous prime is 28271743. The next prime is 28271767. The reversal of 28271749 is 94717282.

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 28271749 - 2³ = 28271741 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 (28271741) 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, 11344 + ... + 13609.

It is an arithmetic number, because the mean of its divisors is an integer number (3892824).

Almost surely, 2^28271749 is an apocalyptic number.

It is an amenable number.

28271749 is a deficient number, since it is larger than the sum of its proper divisors (2870843).

28271749 is a wasteful number, since it uses less digits than its factorization.

28271749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25067.

The product of its digits is 56448, while the sum is 40.

The square root of 28271749 is about 5317.1184865489. The cubic root of 28271749 is about 304.6381052112.

The spelling of 28271749 in words is "twenty-eight million, two hundred seventy-one thousand, seven hundred forty-nine".