30979609840 has 80 divisors (see below), whose sum is σ = 74718967680. Its totient is φ = 11936471040.

The previous prime is 30979609823. The next prime is 30979609883. The reversal of 30979609840 is 4890697903.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199342 + ... + 318898.

It is an arithmetic number, because the mean of its divisors is an integer number (933987096).

Almost surely, 2^30979609840 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 30979609840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37359483840).

30979609840 is an abundant number, since it is smaller than the sum of its proper divisors (43739357840).

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

30979609840 is a wasteful number, since it uses less digits than its factorization.

30979609840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119690 (or 119684 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 30979609840 in words is "thirty billion, nine hundred seventy-nine million, six hundred nine thousand, eight hundred forty".