30920610640 has 80 divisors (see below), whose sum is σ = 75757561920. Its totient is φ = 11704366080.

The previous prime is 30920610587. The next prime is 30920610653. The reversal of 30920610640 is 4601602903.

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, 1428700 + ... + 1450180.

It is an arithmetic number, because the mean of its divisors is an integer number (946969524).

Almost surely, 2^30920610640 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 30920610640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37878780960).

30920610640 is an abundant number, since it is smaller than the sum of its proper divisors (44836951280).

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

30920610640 is a wasteful number, since it uses less digits than its factorization.

30920610640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22460 (or 22454 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 30920610640 in words is "thirty billion, nine hundred twenty million, six hundred ten thousand, six hundred forty".