30982640 has 80 divisors (see below), whose sum is σ = 80161536. Its totient is φ = 11070720.

The previous prime is 30982639. The next prime is 30982649. The reversal of 30982640 is 4628903.

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

It is a junction number, because it is equal to n+sod(n) for n = 30982597 and 30982606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30982649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 999425 + ... + 999455.

Almost surely, 2^30982640 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 30982640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40080768).

30982640 is an abundant number, since it is smaller than the sum of its proper divisors (49178896).

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

30982640 is an equidigital number, since it uses as much as digits as its factorization.

30982640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 30982640 is about 5566.2051704909. The cubic root of 30982640 is about 314.0794151843.

The spelling of 30982640 in words is "thirty million, nine hundred eighty-two thousand, six hundred forty".