320421988 has 6 divisors (see below), whose sum is σ = 560738486. Its totient is φ = 160210992.

The previous prime is 320421971. The next prime is 320421991. The reversal of 320421988 is 889124023.

It can be written as a sum of positive squares in only one way, i.e., 294534244 + 25887744 = 17162^2 + 5088^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40052745 + ... + 40052752.

Almost surely, 2^320421988 is an apocalyptic number.

It is an amenable number.

320421988 is a deficient number, since it is larger than the sum of its proper divisors (240316498).

320421988 is a wasteful number, since it uses less digits than its factorization.

320421988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80105501 (or 80105499 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 320421988 is about 17900.3348572031. The cubic root of 320421988 is about 684.2909088258.

The spelling of 320421988 in words is "three hundred twenty million, four hundred twenty-one thousand, nine hundred eighty-eight".