318728642 has 16 divisors (see below), whose sum is σ = 490644000. Its totient is φ = 155202432.

The previous prime is 318728621. The next prime is 318728713. The reversal of 318728642 is 246827813.

It is a self number, because there is not a number n which added to its sum of digits gives 318728642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25109 + ... + 35607.

It is an arithmetic number, because the mean of its divisors is an integer number (30665250).

Almost surely, 2^318728642 is an apocalyptic number.

318728642 is a deficient number, since it is larger than the sum of its proper divisors (171915358).

318728642 is a wasteful number, since it uses less digits than its factorization.

318728642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10897.

The product of its digits is 129024, while the sum is 41.

The square root of 318728642 is about 17852.9729176964. The cubic root of 318728642 is about 683.0833465639.

The spelling of 318728642 in words is "three hundred eighteen million, seven hundred twenty-eight thousand, six hundred forty-two".