30781221834 has 64 divisors (see below), whose sum is σ = 68326519680. Its totient is φ = 9165792000.

The previous prime is 30781221827. The next prime is 30781221857. The reversal of 30781221834 is 43812218703.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 30781221792 and 30781221801.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4944844 + ... + 4951064.

It is an arithmetic number, because the mean of its divisors is an integer number (1067601870).

Almost surely, 2^30781221834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30781221834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34163259840).

30781221834 is an abundant number, since it is smaller than the sum of its proper divisors (37545297846).

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

30781221834 is a wasteful number, since it uses less digits than its factorization.

30781221834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7527.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 30781221834 in words is "thirty billion, seven hundred eighty-one million, two hundred twenty-one thousand, eight hundred thirty-four".