307885128 has 64 divisors (see below), whose sum is σ = 790732800. Its totient is φ = 99862080.

The previous prime is 307885121. The next prime is 307885157. The reversal of 307885128 is 821588703.

It is a happy number.

307885128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 307885128.

It is not an unprimeable number, because it can be changed into a prime (307885121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144793 + ... + 146903.

It is an arithmetic number, because the mean of its divisors is an integer number (12355200).

Almost surely, 2^307885128 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 307885128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395366400).

307885128 is an abundant number, since it is smaller than the sum of its proper divisors (482847672).

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

307885128 is a wasteful number, since it uses less digits than its factorization.

307885128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2282 (or 2278 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 307885128 is about 17546.6557497433. The cubic root of 307885128 is about 675.2473738033.

The spelling of 307885128 in words is "three hundred seven million, eight hundred eighty-five thousand, one hundred twenty-eight".