320749956 has 60 divisors (see below), whose sum is σ = 852302220. Its totient is φ = 105157440.

The previous prime is 320749907. The next prime is 320749969. The reversal of 320749956 is 659947023.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 164249856 + 156500100 = 12816^2 + 12510^2 .

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 11650 + ... + 27878.

It is an arithmetic number, because the mean of its divisors is an integer number (14205037).

Almost surely, 2^320749956 is an apocalyptic number.

320749956 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320749956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (426151110).

320749956 is an abundant number, since it is smaller than the sum of its proper divisors (531552264).

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

320749956 is a wasteful number, since it uses less digits than its factorization.

320749956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16306 (or 16295 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 320749956 is about 17909.4934601736. The cubic root of 320749956 is about 684.5242979215.

The spelling of 320749956 in words is "three hundred twenty million, seven hundred forty-nine thousand, nine hundred fifty-six".