308213728 has 48 divisors (see below), whose sum is σ = 624307824. Its totient is φ = 149693440.

The previous prime is 308213713. The next prime is 308213743. The reversal of 308213728 is 827312803.

It is an interprime number because it is at equal distance from previous prime (308213713) and next prime (308213743).

It is a junction number, because it is equal to n+sod(n) for n = 308213693 and 308213702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454926 + ... + 455602.

It is an arithmetic number, because the mean of its divisors is an integer number (13006413).

Almost surely, 2^308213728 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 308213728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312153912).

308213728 is an abundant number, since it is smaller than the sum of its proper divisors (316094096).

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

308213728 is a wasteful number, since it uses less digits than its factorization.

308213728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 308213728 is about 17556.0168603246. The cubic root of 308213728 is about 675.4875146603.

The spelling of 308213728 in words is "three hundred eight million, two hundred thirteen thousand, seven hundred twenty-eight".