28245739 has 8 divisors (see below), whose sum is σ = 29592000. Its totient is φ = 26924352.

The previous prime is 28245727. The next prime is 28245779. The reversal of 28245739 is 93754282.

28245739 is nontrivially palindromic in base 2.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28245739 - 2⁷ = 28245611 is a prime.

It is a super-2 number, since 2×28245739² = 1595643543312242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28245779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3874 + ... + 8455.

It is an arithmetic number, because the mean of its divisors is an integer number (3699000).

Almost surely, 2^28245739 is an apocalyptic number.

28245739 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28245739 is a deficient number, since it is larger than the sum of its proper divisors (1346261).

28245739 is a wasteful number, since it uses less digits than its factorization.

28245739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12437.

The product of its digits is 120960, while the sum is 40.

The square root of 28245739 is about 5314.6720500893. The cubic root of 28245739 is about 304.5446542274.

The spelling of 28245739 in words is "twenty-eight million, two hundred forty-five thousand, seven hundred thirty-nine".