28085739 has 16 divisors (see below), whose sum is σ = 40984704. Its totient is φ = 16966400.

The previous prime is 28085723. The next prime is 28085749. The reversal of 28085739 is 93758082.

It is not a de Polignac number, because 28085739 - 2⁴ = 28085723 is a prime.

It is a super-2 number, since 2×28085739² = 1577617470352242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28085739.

It is not an unprimeable number, because it can be changed into a prime (28085719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10444 + ... + 12854.

It is an arithmetic number, because the mean of its divisors is an integer number (2561544).

Almost surely, 2^28085739 is an apocalyptic number.

28085739 is a deficient number, since it is larger than the sum of its proper divisors (12898965).

28085739 is a wasteful number, since it uses less digits than its factorization.

28085739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 28085739 is about 5299.5980036225. The cubic root of 28085739 is about 303.9685267220.

The spelling of 28085739 in words is "twenty-eight million, eighty-five thousand, seven hundred thirty-nine".