31240140320 has 48 divisors (see below), whose sum is σ = 74535610968. Its totient is φ = 12372326400.

The previous prime is 31240140319. The next prime is 31240140341. The reversal of 31240140320 is 2304104213.

It can be written as a sum of positive squares in 4 ways, for example, as 29461662736 + 1778477584 = 171644^2 + 42172^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31240140292 and 31240140301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950429 + ... + 982748.

Almost surely, 2^31240140320 is an apocalyptic number.

It is an amenable number.

31240140320 is an abundant number, since it is smaller than the sum of its proper divisors (43295470648).

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

31240140320 is a wasteful number, since it uses less digits than its factorization.

31240140320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933293 (or 1933285 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31240140320 its reverse (2304104213), we get a palindrome (33544244533).

The spelling of 31240140320 in words is "thirty-one billion, two hundred forty million, one hundred forty thousand, three hundred twenty".