31450240 has 64 divisors (see below), whose sum is σ = 75906360. Its totient is φ = 12460032.

The previous prime is 31450219. The next prime is 31450247. The reversal of 31450240 is 4205413.

It can be written as a sum of positive squares in 4 ways, for example, as 11451456 + 19998784 = 3384^2 + 4472^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (31450247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100324 + ... + 100636.

Almost surely, 2^31450240 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 31450240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37953180).

31450240 is an abundant number, since it is smaller than the sum of its proper divisors (44456120).

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

31450240 is a wasteful number, since it uses less digits than its factorization.

31450240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 31450240 is about 5608.0513549717. The cubic root of 31450240 is about 315.6515948574.

Adding to 31450240 its reverse (4205413), we get a palindrome (35655653).

The spelling of 31450240 in words is "thirty-one million, four hundred fifty thousand, two hundred forty".