320405525 has 48 divisors (see below), whose sum is σ = 456399360. Its totient is φ = 220862400.

The previous prime is 320405497. The next prime is 320405563. The reversal of 320405525 is 525504023.

It is not a de Polignac number, because 320405525 - 2⁶ = 320405461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320405494 and 320405503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1132034 + ... + 1132316.

It is an arithmetic number, because the mean of its divisors is an integer number (9508320).

Almost surely, 2^320405525 is an apocalyptic number.

It is an amenable number.

320405525 is a deficient number, since it is larger than the sum of its proper divisors (135993835).

320405525 is a wasteful number, since it uses less digits than its factorization.

320405525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 320405525 is about 17899.8749995635. The cubic root of 320405525 is about 684.2791892034.

Adding to 320405525 its reverse (525504023), we get a palindrome (845909548).

The spelling of 320405525 in words is "three hundred twenty million, four hundred five thousand, five hundred twenty-five".