30811579794 has 80 divisors (see below), whose sum is σ = 70399929600. Its totient is φ = 10069279776.

The previous prime is 30811579789. The next prime is 30811579819. The reversal of 30811579794 is 49797511803.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 30811579794.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3713919 + ... + 3722205.

It is an arithmetic number, because the mean of its divisors is an integer number (879999120).

Almost surely, 2^30811579794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30811579794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35199964800).

30811579794 is an abundant number, since it is smaller than the sum of its proper divisors (39588349806).

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

30811579794 is a wasteful number, since it uses less digits than its factorization.

30811579794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8749 (or 8740 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 30811579794 in words is "thirty billion, eight hundred eleven million, five hundred seventy-nine thousand, seven hundred ninety-four".