30000780 has 72 divisors (see below), whose sum is σ = 94388112. Its totient is φ = 7998912.

The previous prime is 30000769. The next prime is 30000781. The reversal of 30000780 is 8700003.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (30000781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1774 + ... + 7946.

It is an arithmetic number, because the mean of its divisors is an integer number (1310946).

Almost surely, 2^30000780 is an apocalyptic number.

30000780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30000780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47194056).

30000780 is an abundant number, since it is smaller than the sum of its proper divisors (64387332).

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

30000780 is a wasteful number, since it uses less digits than its factorization.

30000780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6197 (or 6183 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 30000780 is about 5477.2967785213. The cubic root of 30000780 is about 310.7259435069.

Adding to 30000780 its reverse (8700003), we get a palindrome (38700783).

The spelling of 30000780 in words is "thirty million, seven hundred eighty", and thus it is an aban number.