30245215720 has 128 divisors (see below), whose sum is σ = 71092224000. Its totient is φ = 11567888640.

The previous prime is 30245215711. The next prime is 30245215723. The reversal of 30245215720 is 2751254203.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (30245215723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65324209 + ... + 65324671.

It is an arithmetic number, because the mean of its divisors is an integer number (555408000).

Almost surely, 2^30245215720 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 30245215720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35546112000).

30245215720 is an abundant number, since it is smaller than the sum of its proper divisors (40847008280).

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

30245215720 is a wasteful number, since it uses less digits than its factorization.

30245215720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

Adding to 30245215720 its reverse (2751254203), we get a palindrome (32996469923).

The spelling of 30245215720 in words is "thirty billion, two hundred forty-five million, two hundred fifteen thousand, seven hundred twenty".