320545540 has 48 divisors (see below), whose sum is σ = 814568832. Its totient is φ = 103435776.

The previous prime is 320545483. The next prime is 320545543. The reversal of 320545540 is 45545023.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 320545499 and 320545508.

It is not an unprimeable number, because it can be changed into a prime (320545543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64962 + ... + 69721.

It is an arithmetic number, because the mean of its divisors is an integer number (16970184).

Almost surely, 2^320545540 is an apocalyptic number.

It is an amenable number.

320545540 is an abundant number, since it is smaller than the sum of its proper divisors (494023292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320545540 is a wasteful number, since it uses less digits than its factorization.

320545540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134716 (or 134714 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 320545540 is about 17903.7856332118. The cubic root of 320545540 is about 684.3788497799.

The spelling of 320545540 in words is "three hundred twenty million, five hundred forty-five thousand, five hundred forty".