30128490 has 128 divisors (see below), whose sum is σ = 96768000. Its totient is φ = 6516288.

The previous prime is 30128489. The next prime is 30128503. The reversal of 30128490 is 9482103.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35491 + ... + 36329.

It is an arithmetic number, because the mean of its divisors is an integer number (756000).

Almost surely, 2^30128490 is an apocalyptic number.

30128490 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30128490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48384000).

30128490 is an abundant number, since it is smaller than the sum of its proper divisors (66639510).

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

30128490 is a wasteful number, since it uses less digits than its factorization.

30128490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 30128490 is about 5488.9425211055. The cubic root of 30128490 is about 311.1662279994.

The spelling of 30128490 in words is "thirty million, one hundred twenty-eight thousand, four hundred ninety".