30128280 has 256 divisors, whose sum is σ = 116121600. Its totient is φ = 6082560.

The previous prime is 30128239. The next prime is 30128299. The reversal of 30128280 is 8282103.

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

It is a self number, because there is not a number n which added to its sum of digits gives 30128280.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 338476 + ... + 338564.

It is an arithmetic number, because the mean of its divisors is an integer number (453600).

Almost surely, 2^30128280 is an apocalyptic number.

30128280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30128280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58060800).

30128280 is an abundant number, since it is smaller than the sum of its proper divisors (85993320).

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

30128280 is a wasteful number, since it uses less digits than its factorization.

30128280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 150 counting only the distinct ones).

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

The square root of 30128280 is about 5488.9233917044. The cubic root of 30128280 is about 311.1655050396.

The spelling of 30128280 in words is "thirty million, one hundred twenty-eight thousand, two hundred eighty".