31240000000 has 320 divisors, whose sum is σ = 86315404032. Its totient is φ = 11200000000.

The previous prime is 31239999953. The next prime is 31240000007. The reversal of 31240000000 is 4213.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (31240000007) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 439999965 + ... + 440000035.

Almost surely, 2^31240000000 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 31240000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43157702016).

31240000000 is an abundant number, since it is smaller than the sum of its proper divisors (55075404032).

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

31240000000 is an frugal number, since it uses more digits than its factorization.

31240000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 31240000000 its reverse (4213), we get a palindrome (31240004213).

The spelling of 31240000000 in words is "thirty-one billion, two hundred forty million", and thus it is an aban number.