30790128 has 80 divisors (see below), whose sum is σ = 85307040. Its totient is φ = 9535488.

The previous prime is 30790093. The next prime is 30790147. The reversal of 30790128 is 82109703.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 30790095 and 30790104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78958 + ... + 79346.

It is an arithmetic number, because the mean of its divisors is an integer number (1066338).

Almost surely, 2^30790128 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 30790128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42653520).

30790128 is an abundant number, since it is smaller than the sum of its proper divisors (54516912).

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

30790128 is a wasteful number, since it uses less digits than its factorization.

30790128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 30790128 is about 5548.8852934621. The cubic root of 30790128 is about 313.4275477460.

The spelling of 30790128 in words is "thirty million, seven hundred ninety thousand, one hundred twenty-eight".