30305790640 has 40 divisors (see below), whose sum is σ = 71616072528. Its totient is φ = 11923587840.

The previous prime is 30305790617. The next prime is 30305790649. The reversal of 30305790640 is 4609750303.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 30305790640.

It is not an unprimeable number, because it can be changed into a prime (30305790649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3100222 + ... + 3109981.

Almost surely, 2^30305790640 is an apocalyptic number.

It is an amenable number.

30305790640 is an abundant number, since it is smaller than the sum of its proper divisors (41310281888).

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

30305790640 is a wasteful number, since it uses less digits than its factorization.

30305790640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210277 (or 6210271 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 37.

The spelling of 30305790640 in words is "thirty billion, three hundred five million, seven hundred ninety thousand, six hundred forty".