30128500 has 24 divisors (see below), whose sum is σ = 65801736. Its totient is φ = 12051200.

The previous prime is 30128489. The next prime is 30128503. The reversal of 30128500 is 582103.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 76176 + 30052324 = 276^2 + 5482^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30128503) 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, 29629 + ... + 30628.

It is an arithmetic number, because the mean of its divisors is an integer number (2741739).

Almost surely, 2^30128500 is an apocalyptic number.

It is an amenable number.

30128500 is an abundant number, since it is smaller than the sum of its proper divisors (35673236).

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

30128500 is a wasteful number, since it uses less digits than its factorization.

30128500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60276 (or 60264 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 30128500 is about 5488.9434320277. The cubic root of 30128500 is about 311.1662624260.

It can be divided in two parts, 30128 and 500, that added together give a triangular number (30628 = T₂₄₇).

The spelling of 30128500 in words is "thirty million, one hundred twenty-eight thousand, five hundred".