320435978 has 4 divisors (see below), whose sum is σ = 480653970. Its totient is φ = 160217988.

The previous prime is 320435971. The next prime is 320436019. The reversal of 320435978 is 879534023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 273472369 + 46963609 = 16537^2 + 6853^2 .

It is not an unprimeable number, because it can be changed into a prime (320435971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80108993 + ... + 80108996.

Almost surely, 2^320435978 is an apocalyptic number.

320435978 is a deficient number, since it is larger than the sum of its proper divisors (160217992).

320435978 is a wasteful number, since it uses less digits than its factorization.

320435978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160217991.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 320435978 is about 17900.7256277504. The cubic root of 320435978 is about 684.3008676622.

The spelling of 320435978 in words is "three hundred twenty million, four hundred thirty-five thousand, nine hundred seventy-eight".