28742017 has 8 divisors (see below), whose sum is σ = 29786240. Its totient is φ = 27714960.

The previous prime is 28742011. The next prime is 28742029. The reversal of 28742017 is 71024782.

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 28742017 - 2³ = 28742009 is a prime.

It is a super-2 number, since 2×28742017² = 1652207082456578, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28742017.

It is not an unprimeable number, because it can be changed into a prime (28742011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834 + ... + 7627.

It is an arithmetic number, because the mean of its divisors is an integer number (3723280).

Almost surely, 2^28742017 is an apocalyptic number.

It is an amenable number.

28742017 is a deficient number, since it is larger than the sum of its proper divisors (1044223).

28742017 is an equidigital number, since it uses as much as digits as its factorization.

28742017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8583.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 28742017 is about 5361.1581771106. The cubic root of 28742017 is about 306.3179267902.

Adding to 28742017 its reverse (71024782), we get a palindrome (99766799).

The spelling of 28742017 in words is "twenty-eight million, seven hundred forty-two thousand, seventeen".