31324012040 has 64 divisors (see below), whose sum is σ = 72784398960. Its totient is φ = 12123509760.

The previous prime is 31324012037. The next prime is 31324012051. The reversal of 31324012040 is 4021042313.

It can be written as a sum of positive squares in 8 ways, for example, as 16874529604 + 14449482436 = 129902^2 + 120206^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209414 + ... + 326346.

Almost surely, 2^31324012040 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 31324012040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36392199480).

31324012040 is an abundant number, since it is smaller than the sum of its proper divisors (41460386920).

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

31324012040 is a wasteful number, since it uses less digits than its factorization.

31324012040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117162 (or 117158 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31324012040 its reverse (4021042313), we get a palindrome (35345054353).

The spelling of 31324012040 in words is "thirty-one billion, three hundred twenty-four million, twelve thousand, forty".