30428538 has 64 divisors (see below), whose sum is σ = 77552640. Its totient is φ = 7748352.

The previous prime is 30428537. The next prime is 30428539. The reversal of 30428538 is 83582403.

It is an interprime number because it is at equal distance from previous prime (30428537) and next prime (30428539).

It is a junction number, because it is equal to n+sod(n) for n = 30428499 and 30428508.

It is not an unprimeable number, because it can be changed into a prime (30428533) 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 31 ways as a sum of consecutive naturals, for example, 12445 + ... + 14687.

It is an arithmetic number, because the mean of its divisors is an integer number (1211760).

Almost surely, 2^30428538 is an apocalyptic number.

30428538 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30428538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38776320).

30428538 is an abundant number, since it is smaller than the sum of its proper divisors (47124102).

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

30428538 is a wasteful number, since it uses less digits than its factorization.

30428538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 30428538 is about 5516.2068489135. The cubic root of 30428538 is about 312.1957803107.

The spelling of 30428538 in words is "thirty million, four hundred twenty-eight thousand, five hundred thirty-eight".