308020128 has 48 divisors (see below), whose sum is σ = 870752736. Its totient is φ = 94775040.

The previous prime is 308020109. The next prime is 308020129. The reversal of 308020128 is 821020803.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is a junction number, because it is equal to n+sod(n) for n = 308020098 and 308020107.

It is not an unprimeable number, because it can be changed into a prime (308020129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122158 + ... + 124653.

It is an arithmetic number, because the mean of its divisors is an integer number (18140682).

Almost surely, 2^308020128 is an apocalyptic number.

It is an amenable number.

308020128 is an abundant number, since it is smaller than the sum of its proper divisors (562732608).

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

308020128 is a wasteful number, since it uses less digits than its factorization.

308020128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246837 (or 246829 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 308020128 is about 17550.5022150365. The cubic root of 308020128 is about 675.3460524628.

The spelling of 308020128 in words is "three hundred eight million, twenty thousand, one hundred twenty-eight".