320816390 has 32 divisors (see below), whose sum is σ = 595105056. Its totient is φ = 124445440.

The previous prime is 320816359. The next prime is 320816417. The reversal of 320816390 is 93618023.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 68669 + ... + 73191.

It is an arithmetic number, because the mean of its divisors is an integer number (18597033).

Almost surely, 2^320816390 is an apocalyptic number.

320816390 is a deficient number, since it is larger than the sum of its proper divisors (274288666).

320816390 is a wasteful number, since it uses less digits than its factorization.

320816390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4744.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 320816390 is about 17911.3480788019. The cubic root of 320816390 is about 684.5715544080.

The spelling of 320816390 in words is "three hundred twenty million, eight hundred sixteen thousand, three hundred ninety".