28242739 has 8 divisors (see below), whose sum is σ = 32313600. Its totient is φ = 24180936.

The previous prime is 28242719. The next prime is 28242743. The reversal of 28242739 is 93724282.

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 28242739 - 2⁷ = 28242611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28242698 and 28242707.

It is not an unprimeable number, because it can be changed into a prime (28242719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6912 + ... + 10210.

It is an arithmetic number, because the mean of its divisors is an integer number (4039200).

Almost surely, 2^28242739 is an apocalyptic number.

28242739 is a deficient number, since it is larger than the sum of its proper divisors (4070861).

28242739 is a wasteful number, since it uses less digits than its factorization.

28242739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4529.

The product of its digits is 48384, while the sum is 37.

The square root of 28242739 is about 5314.3898050482. The cubic root of 28242739 is about 304.5338718777.

It can be divided in two parts, 2824273 and 9, that added together give a palindrome (2824282).

The spelling of 28242739 in words is "twenty-eight million, two hundred forty-two thousand, seven hundred thirty-nine".