31440033030 has 128 divisors (see below), whose sum is σ = 90029491200. Its totient is φ = 6874689024.

The previous prime is 31440033029. The next prime is 31440033049. The reversal of 31440033030 is 3033004413.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31440032988 and 31440033006.

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, 640129 + ... + 687491.

It is an arithmetic number, because the mean of its divisors is an integer number (703355400).

Almost surely, 2^31440033030 is an apocalyptic number.

31440033030 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 31440033030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45014745600).

31440033030 is an abundant number, since it is smaller than the sum of its proper divisors (58589458170).

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

31440033030 is a wasteful number, since it uses less digits than its factorization.

31440033030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47518.

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 31440033030 its reverse (3033004413), we get a palindrome (34473037443).

The spelling of 31440033030 in words is "thirty-one billion, four hundred forty million, thirty-three thousand, thirty".