31998000030 has 64 divisors (see below), whose sum is σ = 78334041600. Its totient is φ = 8363101824.

The previous prime is 31998000029. The next prime is 31998000031. The reversal of 31998000030 is 3000089913.

It is an interprime number because it is at equal distance from previous prime (31998000029) and next prime (31998000031).

It is a junction number, because it is equal to n+sod(n) for n = 31997999955 and 31998000000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31998000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 359992 + ... + 439988.

It is an arithmetic number, because the mean of its divisors is an integer number (1223969400).

Almost surely, 2^31998000030 is an apocalyptic number.

31998000030 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31998000030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39167020800).

31998000030 is an abundant number, since it is smaller than the sum of its proper divisors (46336041570).

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

31998000030 is a wasteful number, since it uses less digits than its factorization.

31998000030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80273.

The product of its (nonzero) digits is 5832, while the sum is 33.

Adding to 31998000030 its reverse (3000089913), we get a palindrome (34998089943).

The spelling of 31998000030 in words is "thirty-one billion, nine hundred ninety-eight million, thirty", and thus it is an aban number.