30999638040 has 256 divisors, whose sum is σ = 113538309120. Its totient is φ = 6609469440.

The previous prime is 30999638011. The next prime is 30999638071. The reversal of 30999638040 is 4083699903.

It is a super-2 number, since 2×30999638040² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1604035 + ... + 1623245.

It is an arithmetic number, because the mean of its divisors is an integer number (443509020).

Almost surely, 2^30999638040 is an apocalyptic number.

30999638040 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 30999638040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56769154560).

30999638040 is an abundant number, since it is smaller than the sum of its proper divisors (82538671080).

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

30999638040 is a wasteful number, since it uses less digits than its factorization.

30999638040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19362 (or 19358 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 51.

The spelling of 30999638040 in words is "thirty billion, nine hundred ninety-nine million, six hundred thirty-eight thousand, forty".