28742245 has 8 divisors (see below), whose sum is σ = 39417984. Its totient is φ = 19708944.

The previous prime is 28742243. The next prime is 28742251. The reversal of 28742245 is 54224782.

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 28742245 - 2¹ = 28742243 is a prime.

It is a super-3 number, since 3×28742245³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 28742245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28742243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410569 + ... + 410638.

It is an arithmetic number, because the mean of its divisors is an integer number (4927248).

Almost surely, 2^28742245 is an apocalyptic number.

It is an amenable number.

28742245 is a deficient number, since it is larger than the sum of its proper divisors (10675739).

28742245 is an equidigital number, since it uses as much as digits as its factorization.

28742245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821219.

The product of its digits is 35840, while the sum is 34.

The square root of 28742245 is about 5361.1794411305. The cubic root of 28742245 is about 306.3187367577.

The spelling of 28742245 in words is "twenty-eight million, seven hundred forty-two thousand, two hundred forty-five".