320531136 has 28 divisors (see below), whose sum is σ = 848072472. Its totient is φ = 106843648.

The previous prime is 320531131. The next prime is 320531137. The reversal of 320531136 is 631135023.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (320531131) 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 3 ways as a sum of consecutive naturals, for example, 834525 + ... + 834908.

Almost surely, 2^320531136 is an apocalyptic number.

It is an amenable number.

320531136 is an abundant number, since it is smaller than the sum of its proper divisors (527541336).

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

320531136 is a wasteful number, since it uses less digits than its factorization.

320531136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669448 (or 1669438 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 320531136 is about 17903.3833673973. The cubic root of 320531136 is about 684.3685985682.

Adding to 320531136 its reverse (631135023), we get a palindrome (951666159).

The spelling of 320531136 in words is "three hundred twenty million, five hundred thirty-one thousand, one hundred thirty-six".