308731968 has 168 divisors, whose sum is σ = 961080120. Its totient is φ = 94371840.

The previous prime is 308731963. The next prime is 308731979. The reversal of 308731968 is 869137803.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12616704 + 296115264 = 3552^2 + 17208^2 .

It is not an unprimeable number, because it can be changed into a prime (308731961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 401088 + ... + 401856.

It is an arithmetic number, because the mean of its divisors is an integer number (5720715).

Almost surely, 2^308731968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308731968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (480540060).

308731968 is an abundant number, since it is smaller than the sum of its proper divisors (652348152).

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

308731968 is a wasteful number, since it uses less digits than its factorization.

308731968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845 (or 832 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 308731968 is about 17570.7702733830. The cubic root of 308731968 is about 675.8658977948.

The spelling of 308731968 in words is "three hundred eight million, seven hundred thirty-one thousand, nine hundred sixty-eight".