242728291 has 4 divisors (see below), whose sum is σ = 261399712. Its totient is φ = 224056872.

The previous prime is 242728279. The next prime is 242728303. The reversal of 242728291 is 192827242.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (242728279) and next prime (242728303).

It is not a de Polignac number, because 242728291 - 2¹¹ = 242726243 is a prime.

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 242728291.

It is not an unprimeable number, because it can be changed into a prime (242728201) 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 3 ways as a sum of consecutive naturals, for example, 9335691 + ... + 9335716.

It is an arithmetic number, because the mean of its divisors is an integer number (65349928).

Almost surely, 2^242728291 is an apocalyptic number.

242728291 is a deficient number, since it is larger than the sum of its proper divisors (18671421).

242728291 is a wasteful number, since it uses less digits than its factorization.

242728291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18671420.

The product of its digits is 32256, while the sum is 37.

The square root of 242728291 is about 15579.7397603426. The cubic root of 242728291 is about 623.7924768430.

The spelling of 242728291 in words is "two hundred forty-two million, seven hundred twenty-eight thousand, two hundred ninety-one".