30899905920 has 480 divisors, whose sum is σ = 119524371120. Its totient is φ = 7603974144.

The previous prime is 30899905919. The next prime is 30899905957. The reversal of 30899905920 is 2950999803.

It is a tau number, because it is divible by the number of its divisors (480).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 8759197 + ... + 8762723.

Almost surely, 2^30899905920 is an apocalyptic number.

30899905920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30899905920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59762185560).

30899905920 is an abundant number, since it is smaller than the sum of its proper divisors (88624465200).

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

30899905920 is a wasteful number, since it uses less digits than its factorization.

30899905920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584 (or 3550 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The spelling of 30899905920 in words is "thirty billion, eight hundred ninety-nine million, nine hundred five thousand, nine hundred twenty".