205278742 has 8 divisors (see below), whose sum is σ = 309063600. Its totient is φ = 102257544.

The previous prime is 205278709. The next prime is 205278743. The reversal of 205278742 is 247872502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205278743) 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 3 ways as a sum of consecutive naturals, for example, 190242 + ... + 191317.

It is an arithmetic number, because the mean of its divisors is an integer number (38632950).

Almost surely, 2^205278742 is an apocalyptic number.

205278742 is a deficient number, since it is larger than the sum of its proper divisors (103784858).

205278742 is a wasteful number, since it uses less digits than its factorization.

205278742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381830.

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 205278742 is about 14327.5518494961. The cubic root of 205278742 is about 589.9039793944.

The spelling of 205278742 in words is "two hundred five million, two hundred seventy-eight thousand, seven hundred forty-two".