31424321440 has 24 divisors (see below), whose sum is σ = 74239959780. Its totient is φ = 12569728512.

The previous prime is 31424321431. The next prime is 31424321447. The reversal of 31424321440 is 4412342413.

It can be written as a sum of positive squares in 2 ways, for example, as 30850814736 + 573506704 = 175644^2 + 23948^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31424321399 and 31424321408.

It is not an unprimeable number, because it can be changed into a prime (31424321447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98200845 + ... + 98201164.

Almost surely, 2^31424321440 is an apocalyptic number.

It is an amenable number.

31424321440 is an abundant number, since it is smaller than the sum of its proper divisors (42815638340).

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

31424321440 is a wasteful number, since it uses less digits than its factorization.

31424321440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196402024 (or 196402016 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 31424321440 its reverse (4412342413), we get a palindrome (35836663853).

The spelling of 31424321440 in words is "thirty-one billion, four hundred twenty-four million, three hundred twenty-one thousand, four hundred forty".