30278801920 has 80 divisors (see below), whose sum is σ = 72764762400. Its totient is φ = 12083728384.

The previous prime is 30278801879. The next prime is 30278801989. The reversal of 30278801920 is 2910887203.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1120731 + ... + 1147429.

It is an arithmetic number, because the mean of its divisors is an integer number (909559530).

Almost surely, 2^30278801920 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 30278801920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36382381200).

30278801920 is an abundant number, since it is smaller than the sum of its proper divisors (42485960480).

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

30278801920 is an equidigital number, since it uses as much as digits as its factorization.

30278801920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27165 (or 27149 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 30278801920 in words is "thirty billion, two hundred seventy-eight million, eight hundred one thousand, nine hundred twenty".