320129978 has 8 divisors (see below), whose sum is σ = 548794272. Its totient is φ = 137198556.

The previous prime is 320129977. The next prime is 320129987. The reversal of 320129978 is 879921023.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (320129977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11433200 + ... + 11433227.

It is an arithmetic number, because the mean of its divisors is an integer number (68599284).

Almost surely, 2^320129978 is an apocalyptic number.

320129978 is a deficient number, since it is larger than the sum of its proper divisors (228664294).

320129978 is a wasteful number, since it uses less digits than its factorization.

320129978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22866436.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 320129978 is about 17892.1764467043. The cubic root of 320129978 is about 684.0829741573.

The spelling of 320129978 in words is "three hundred twenty million, one hundred twenty-nine thousand, nine hundred seventy-eight".