30683840 has 112 divisors (see below), whose sum is σ = 83393280. Its totient is φ = 10644480.

The previous prime is 30683813. The next prime is 30683843. The reversal of 30683840 is 4838603.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 30683797 and 30683806.

It is not an unprimeable number, because it can be changed into a prime (30683843) 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, 80771 + ... + 81149.

Almost surely, 2^30683840 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 30683840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41696640).

30683840 is an abundant number, since it is smaller than the sum of its proper divisors (52709440).

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

30683840 is a wasteful number, since it uses less digits than its factorization.

30683840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 30683840 is about 5539.2995947141. The cubic root of 30683840 is about 313.0664797019.

The spelling of 30683840 in words is "thirty million, six hundred eighty-three thousand, eight hundred forty".