308312928 has 144 divisors (see below), whose sum is σ = 1093188096. Its totient is φ = 80075520.

The previous prime is 308312923. The next prime is 308312941. The reversal of 308312928 is 829213803.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 308312892 and 308312901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308312923) 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, 15225 + ... + 29127.

It is an arithmetic number, because the mean of its divisors is an integer number (7591584).

Almost surely, 2^308312928 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 308312928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (546594048).

308312928 is an abundant number, since it is smaller than the sum of its proper divisors (784875168).

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

308312928 is a wasteful number, since it uses less digits than its factorization.

308312928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13937 (or 13926 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 308312928 is about 17558.8418752491. The cubic root of 308312928 is about 675.5599764702.

It can be divided in two parts, 308 and 312928, that added together give a triangular number (313236 = T₇₉₁).

The spelling of 308312928 in words is "three hundred eight million, three hundred twelve thousand, nine hundred twenty-eight".