31725223240 has 16 divisors (see below), whose sum is σ = 71381752380. Its totient is φ = 12690089280.

The previous prime is 31725223199. The next prime is 31725223241. The reversal of 31725223240 is 4232252713.

It can be written as a sum of positive squares in 2 ways, for example, as 30083514916 + 1641708324 = 173446^2 + 40518^2 .

It is a super-3 number, since 3×31725223240³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31725223241) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 396565251 + ... + 396565330.

Almost surely, 2^31725223240 is an apocalyptic number.

It is an amenable number.

31725223240 is an abundant number, since it is smaller than the sum of its proper divisors (39656529140).

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

31725223240 is a wasteful number, since it uses less digits than its factorization.

31725223240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793130592 (or 793130588 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

Adding to 31725223240 its reverse (4232252713), we get a palindrome (35957475953).

The spelling of 31725223240 in words is "thirty-one billion, seven hundred twenty-five million, two hundred twenty-three thousand, two hundred forty".