28705361 has 4 divisors (see below), whose sum is σ = 29068800. Its totient is φ = 28341924.

The previous prime is 28705343. The next prime is 28705363. The reversal of 28705361 is 16350782.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28705361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28705363) 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, 181601 + ... + 181758.

It is an arithmetic number, because the mean of its divisors is an integer number (7267200).

Almost surely, 2^28705361 is an apocalyptic number.

It is an amenable number.

28705361 is a deficient number, since it is larger than the sum of its proper divisors (363439).

28705361 is an equidigital number, since it uses as much as digits as its factorization.

28705361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363438.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 28705361 is about 5357.7384221330. The cubic root of 28705361 is about 306.1876510030.

The spelling of 28705361 in words is "twenty-eight million, seven hundred five thousand, three hundred sixty-one".