30128388 has 48 divisors (see below), whose sum is σ = 72495360. Its totient is φ = 9734400.

The previous prime is 30128387. The next prime is 30128393. The reversal of 30128388 is 88382103.

It is not an unprimeable number, because it can be changed into a prime (30128381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57568 + ... + 58088.

It is an arithmetic number, because the mean of its divisors is an integer number (1510320).

Almost surely, 2^30128388 is an apocalyptic number.

It is an amenable number.

30128388 is an abundant number, since it is smaller than the sum of its proper divisors (42366972).

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

30128388 is a wasteful number, since it uses less digits than its factorization.

30128388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 30128388 is about 5488.9332296904. The cubic root of 30128388 is about 311.1658768479.

The spelling of 30128388 in words is "thirty million, one hundred twenty-eight thousand, three hundred eighty-eight".