320545557 has 24 divisors (see below), whose sum is σ = 491211864. Its totient is φ = 200730624.

The previous prime is 320545553. The next prime is 320545567. The reversal of 320545557 is 755545023.

It can be written as a sum of positive squares in 4 ways, for example, as 155525841 + 165019716 = 12471^2 + 12846^2 .

It is not a de Polignac number, because 320545557 - 2² = 320545553 is a prime.

It is a super-2 number, since 2×320545557² = 205498908224880498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320545553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88963 + ... + 92495.

It is an arithmetic number, because the mean of its divisors is an integer number (20467161).

Almost surely, 2^320545557 is an apocalyptic number.

It is an amenable number.

320545557 is a deficient number, since it is larger than the sum of its proper divisors (170666307).

320545557 is a wasteful number, since it uses less digits than its factorization.

320545557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4149 (or 4146 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 36.

The square root of 320545557 is about 17903.7861079717. The cubic root of 320545557 is about 684.3788618785.

The spelling of 320545557 in words is "three hundred twenty million, five hundred forty-five thousand, five hundred fifty-seven".