28985739 has 4 divisors (see below), whose sum is σ = 38647656. Its totient is φ = 19323824.

The previous prime is 28985717. The next prime is 28985767. The reversal of 28985739 is 93758982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28985739 - 2¹³ = 28977547 is a prime.

It is a super-2 number, since 2×28985739² = 1680346130752242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28985691 and 28985700.

It is not an unprimeable number, because it can be changed into a prime (28985039) 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, 4830954 + ... + 4830959.

It is an arithmetic number, because the mean of its divisors is an integer number (9661914).

Almost surely, 2^28985739 is an apocalyptic number.

28985739 is a deficient number, since it is larger than the sum of its proper divisors (9661917).

28985739 is an equidigital number, since it uses as much as digits as its factorization.

28985739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9661916.

The product of its digits is 1088640, while the sum is 51.

The square root of 28985739 is about 5383.8405437011. The cubic root of 28985739 is about 307.1813130350.

The spelling of 28985739 in words is "twenty-eight million, nine hundred eighty-five thousand, seven hundred thirty-nine".