31640633320540 has 48 divisors (see below), whose sum is σ = 66912218049600. Its totient is φ = 12567623224320.

The previous prime is 31640633320537. The next prime is 31640633320553. The reversal of 31640633320540 is 4502333604613.

It is a super-2 number, since 2×31640633320540² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31640633320493 and 31640633320502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7722472 + ... + 11086831.

It is an arithmetic number, because the mean of its divisors is an integer number (1394004542700).

Almost surely, 2^{31640633320540} is an apocalyptic number.

It is an amenable number.

31640633320540 is an abundant number, since it is smaller than the sum of its proper divisors (35271584729060).

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

31640633320540 is a wasteful number, since it uses less digits than its factorization.

31640633320540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18809902 (or 18809900 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 40.

The spelling of 31640633320540 in words is "thirty-one trillion, six hundred forty billion, six hundred thirty-three million, three hundred twenty thousand, five hundred forty".