31663040 has 28 divisors (see below), whose sum is σ = 75398376. Its totient is φ = 12665088.

The previous prime is 31663013. The next prime is 31663057. The reversal of 31663040 is 4036613.

It is a junction number, because it is equal to n+sod(n) for n = 31662997 and 31663015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49154 + ... + 49793.

Almost surely, 2^31663040 is an apocalyptic number.

It is an amenable number.

31663040 is an abundant number, since it is smaller than the sum of its proper divisors (43735336).

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

31663040 is an equidigital number, since it uses as much as digits as its factorization.

31663040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98964 (or 98954 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 31663040 is about 5626.9920916952. The cubic root of 31663040 is about 316.3619204237.

Adding to 31663040 its reverse (4036613), we get a palindrome (35699653).

The spelling of 31663040 in words is "thirty-one million, six hundred sixty-three thousand, forty".