28360739 has 4 divisors (see below), whose sum is σ = 30939000. Its totient is φ = 25782480.

The previous prime is 28360733. The next prime is 28360747. The reversal of 28360739 is 93706382.

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 28360739 - 2²⁰ = 27312163 is a prime.

It is a super-2 number, since 2×28360739² = 1608663033252242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28360733) 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, 1289114 + ... + 1289135.

It is an arithmetic number, because the mean of its divisors is an integer number (7734750).

Almost surely, 2^28360739 is an apocalyptic number.

28360739 is a deficient number, since it is larger than the sum of its proper divisors (2578261).

28360739 is a wasteful number, since it uses less digits than its factorization.

28360739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2578260.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 28360739 is about 5325.4801661446. The cubic root of 28360739 is about 304.9574033498.

The spelling of 28360739 in words is "twenty-eight million, three hundred sixty thousand, seven hundred thirty-nine".