30550128 has 120 divisors (see below), whose sum is σ = 94993920. Its totient is φ = 8426880.

The previous prime is 30550103. The next prime is 30550147. The reversal of 30550128 is 82105503.

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

It is a junction number, because it is equal to n+sod(n) for n = 30550098 and 30550107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72703 + ... + 73121.

It is an arithmetic number, because the mean of its divisors is an integer number (791616).

Almost surely, 2^30550128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30550128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47496960).

30550128 is an abundant number, since it is smaller than the sum of its proper divisors (64443792).

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

30550128 is a wasteful number, since it uses less digits than its factorization.

30550128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 30550128 is about 5527.2170212504. The cubic root of 30550128 is about 312.6110640959.

The spelling of 30550128 in words is "thirty million, five hundred fifty thousand, one hundred twenty-eight".