28961749 has 4 divisors (see below), whose sum is σ = 29960460. Its totient is φ = 27963040.

The previous prime is 28961741. The next prime is 28961753. The reversal of 28961749 is 94716982.

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 10771524 + 18190225 = 3282^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 28961749 - 2³ = 28961741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28961699 and 28961708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28961741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499312 + ... + 499369.

It is an arithmetic number, because the mean of its divisors is an integer number (7490115).

Almost surely, 2^28961749 is an apocalyptic number.

28961749 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28961749 is a deficient number, since it is larger than the sum of its proper divisors (998711).

28961749 is an equidigital number, since it uses as much as digits as its factorization.

28961749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998710.

The product of its digits is 217728, while the sum is 46.

The square root of 28961749 is about 5381.6121190587. The cubic root of 28961749 is about 307.0965436053.

The spelling of 28961749 in words is "twenty-eight million, nine hundred sixty-one thousand, seven hundred forty-nine".