30551328 has 72 divisors (see below), whose sum is σ = 88936848. Its totient is φ = 9942912.

The previous prime is 30551309. The next prime is 30551333. The reversal of 30551328 is 82315503.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11151 + ... + 13617.

It is an arithmetic number, because the mean of its divisors is an integer number (1235234).

Almost surely, 2^30551328 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 30551328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44468424).

30551328 is an abundant number, since it is smaller than the sum of its proper divisors (58385520).

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

30551328 is a wasteful number, since it uses less digits than its factorization.

30551328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526 (or 2515 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 30551328 is about 5527.3255739100. The cubic root of 30551328 is about 312.6151571324.

The spelling of 30551328 in words is "thirty million, five hundred fifty-one thousand, three hundred twenty-eight".