31242205472 has 48 divisors (see below), whose sum is σ = 62986315392. Its totient is φ = 15247476480.

The previous prime is 31242205471. The next prime is 31242205523. The reversal of 31242205472 is 27450224213.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (31242205471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533147 + ... + 588837.

It is an arithmetic number, because the mean of its divisors is an integer number (1312214904).

Almost surely, 2^31242205472 is an apocalyptic number.

31242205472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31242205472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31493157696).

31242205472 is an abundant number, since it is smaller than the sum of its proper divisors (31744109920).

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

31242205472 is a wasteful number, since it uses less digits than its factorization.

31242205472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56121 (or 56113 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 32.

Adding to 31242205472 its reverse (27450224213), we get a palindrome (58692429685).

The spelling of 31242205472 in words is "thirty-one billion, two hundred forty-two million, two hundred five thousand, four hundred seventy-two".