30855680 has 80 divisors (see below), whose sum is σ = 78443640. Its totient is φ = 11599872.

The previous prime is 30855661. The next prime is 30855703. The reversal of 30855680 is 8655803.

It can be written as a sum of positive squares in 4 ways, for example, as 23193856 + 7661824 = 4816^2 + 2768^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 30855680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43166 + ... + 43874.

Almost surely, 2^30855680 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 30855680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39221820).

30855680 is an abundant number, since it is smaller than the sum of its proper divisors (47587960).

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

30855680 is an equidigital number, since it uses as much as digits as its factorization.

30855680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 30855680 is about 5554.7889248827. The cubic root of 30855680 is about 313.6498185466.

The spelling of 30855680 in words is "thirty million, eight hundred fifty-five thousand, six hundred eighty".