30431320040 has 128 divisors (see below), whose sum is σ = 75675600000. Its totient is φ = 10921651200.

The previous prime is 30431320009. The next prime is 30431320063. The reversal of 30431320040 is 4002313403.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 30431319994 and 30431320021.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11068586 + ... + 11071334.

It is an arithmetic number, because the mean of its divisors is an integer number (591215625).

Almost surely, 2^30431320040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30431320040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37837800000).

30431320040 is an abundant number, since it is smaller than the sum of its proper divisors (45244279960).

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

30431320040 is a wasteful number, since it uses less digits than its factorization.

30431320040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091 (or 3087 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 30431320040 its reverse (4002313403), we get a palindrome (34433633443).

The spelling of 30431320040 in words is "thirty billion, four hundred thirty-one million, three hundred twenty thousand, forty".