320666390 has 16 divisors (see below), whose sum is σ = 629672400. Its totient is φ = 116605920.

The previous prime is 320666341. The next prime is 320666417. The reversal of 320666390 is 93666023.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 320666390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1457465 + ... + 1457684.

It is an arithmetic number, because the mean of its divisors is an integer number (39354525).

Almost surely, 2^320666390 is an apocalyptic number.

320666390 is a deficient number, since it is larger than the sum of its proper divisors (309006010).

320666390 is a wasteful number, since it uses less digits than its factorization.

320666390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915167.

The product of its (nonzero) digits is 34992, while the sum is 35.

The square root of 320666390 is about 17907.1602997237. The cubic root of 320666390 is about 684.4648456650.

It can be divided in two parts, 3206 and 66390, that added together give a palindrome (69596).

The spelling of 320666390 in words is "three hundred twenty million, six hundred sixty-six thousand, three hundred ninety".